I Put a Spell on You

 is a side quest in Fallout: New Vegas.

Description
Camp McCarran has been compromised and the agent is feeding information to Caesar's Legion about NCR troop movements, find out who this agent is.

Quick walkthrough (NCR)

 * Travel to Camp McCarran and speak to James Hsu or complete The Finger of Suspicion.
 * Speak to Captain Curtis and then to Carrie Boyd.
 * Once you've got adequate information, visit the control tower between midnight and 1:40 a.m. Depending on when you arrive, the spy will walk from the terminal building to the control tower, approaching from the right when facing the door. He may already be there when you arrive, which is indicated by the light in the tower being on. ED-E's Enhanced Sensors perk will also highlight a friendly in the tower (no one else goes there).
 * If you are spotted you will be asked what you're doing outside so late at night. Do not say you're investigating the tower. He will then turn around and head back to bed. This will allow you to try again the next day. You can also pickpocket the bomb codes from him as he sleeps.
 * If you remain unseen (keep your distance and a high stealth/stealth boy shouldn't be needed as you can watch him enter the door then crouch before you enter, you'll remain hidden while you eavesdrop from the bottom of the stairs) follow the spy into the tower and eavesdrop on his radio conversation. Do not confront him unless you want to kill him.
 * Immediately head for the monorail. Note: Reporting the spy to James Hsu will cause the bomb to detonate upon leaving the terminal building, either via entering the monorail station or leaving for the airfield.
 * The bomb is in a vent to the left side of the rear door to the forward car (45 Science, 35 Explosives, or Activation Code required to remove). Note: You can't normally enter the monorail car. Upon catching the spy you can enter the car (same door that is normally open is now open as more than just a doorway to Vegas) then turn left and the vent in front of you should be flashing red.
 * Now report to Hsu.

Detailed walkthrough (NCR)
At some point, or upon asking James Hsu about problems at Camp McCarran, you will be asked to speak with Captain Ronald Curtis, who is located on the first floor of the Camp McCarran Terminal building to the west of the escalators. He will then ask you to speak to Carrie Boyd and Contreras. Talk to Boyd, and then ask her about break-ins. She will say that there have been break-ins at the control tower every night. Ask her for an access key. IMPORTANT: Do not inform Curtis about that lead if you want to save the monorail. You also have to hack the computer terminal beside the door before Curtis will appear.

Go out to the control tower. The most direct route is to go out the back door between the escalators on the ground floor. Move back by one of the planes to the right (the plane closest to the wall is a good place), and Wait until about 12:30 a.m. You may want to save the game prior to doing the Wait.

Sometime at about 12:55 a.m., Curtis can be seen walking towards the tower. It is very important that you remain hidden; otherwise he will confront you and ask why you're there. If you end the dialog successfully, he will then walk back into the base and you will need to wait until the next day. If Curtis starts shooting at you, run outside to the tarmac, then run back to the tower without opening fire on him. Enter the tower and exit, Curtis will no longer be aggressive. It's possible that Curtis may not appear on the tarmac and will already be inside the tower. If the lights are on, he's already there. If you don't see him by 3 a.m., enter the tower and stay hidden as per the next instructions.

If Curtis doesn't see you, he will walk into the tower. Follow him inside, and stay hidden at the bottom of the stairs while you listen to him talking on the radio. The quest will update and tell you to disarm the monorail. If you have a high explosives skill (35) or high science skill (45), you can choose to go directly to the monorail. Otherwise, you will have to pickpocket the Activation Code off of Curtis for a loss of karma points. You can also confront Curtis, in which case he will become hostile, and you can kill him without loss of karma or rep. If you kill him without confronting him, when you report to Colonel Hsu, Hsu will pull his pistol and shoot you, without giving you the option for dialogue. After Curtis becomes hostile, he is fair game to kill. Then loot the Activation Code from his body. (If you don't see him head into the tower go into the tower at 2 AM and you should hear him in a conversation over the radio.)

Once the bomb is defused, if you have not already killed Curtis you may wish to return to the control tower and finish him off for the extra experience and his equipment, as well as the "history point" for Boone's I Forgot To Remember To Forget Companion quest. Be sure to kill and loot Curtis before speaking to Hsu, to gain extra experience you will not get if you do it afterward(because he commits suicide). Return to Hsu, he'll reward you with some caps and a reputation boost. Upon killing Curtis (before reporting to Hsu), the NCR guards on the tarmac may turn hostile on you, so run quickly back to terminal. You should have no problem collecting your reward and xp from Hsu despite the hostile guards outside.

You can also complete the quest and gain the Experience Points with killing Curtis in the tower before hearing the radio conversation (though this is not recommended). When you report it back to Hsu, he will be surprised and tell you Curtis could not be the spy as he was the leader of the investigation. After that, it will be revealed that there's a bomb on the train, the explosion of which you won't be able to prevent. After the train explodes, report it back to Hsu, and then the quest ends, with you gaining a fraction of the XP, Caps and Fame. With the monorail destroyed, you will need a very good reputation with the NCR to complete "No, Not Much."

Walkthrough (Legion)
Follow the map marker to the garbage bin in front of the ticket counter, and take everything inside it. If you don't take everything, you won't be able to frame Davey Crenshaw.
 * If your Reputation is high enough with both the Legion & the NCR you can get the quest from Hsu, then talk to Curtis and you are given an option "I Know who you are, and I work for the Legion too" (NOTE: This does not appear to be true. Speaking to Hsu and then talking to Curtis with 'liked' NCR reputation and 'idolized' Legion reputation still does not offer the option to tell Curtis that you work for the Legion. If this is in fact possible without first completing The Finger of Suspicion, more specific details on the requirements are needed here). This option will also be available if you completed The Finger of Suspicion and learned Curtis is a double agent. Talk to Curtis, and choose the option "Hsu won't trust me enough to let me investigate". Go through the speech options until you get the quest to blow up the monorail.

Once you picked up all the items in the garbage bin, go to Hsu and tell him you will investigate the information leak. Then go to the monorail. If your reputation is high enough you can just walk past the soldiers. If not, then there is a change of guards at 9am and 6pm, which should give you a short time to sneak to the monorail without getting any problems with the guards. Alternatively, don an NCR uniform and the guards will let you pass without attacking. Now enter the monorail, go left, and there is a vent on the wall which you can activate to plant the bomb. The quest tells you to leave the monorail and watch it depart, do not leave without it blowing up as it may stop the quest from being completable. Video of Monorail exploding

Next enter the building, stay upstairs and go into the Concourse. Go left and head to a footlocker that your map marker will point to. Put Abraxo Cleaner, Conductor, Fission Battery, Monorail Sabotage Plans and Wonderglue into the footlocker. Take a left and head outside following the map marker to Davey Crenshaw, who you can just kill and then head back inside and tell Hsu that Davey Crenshaw blew up the monorail. The first option telling him about the evidence will reward 100 caps, so will the second option using speech, and both are still repeatable, which is a bug but a nice way to get a repeatable 100 caps if you need them. The third option doesn't give you anything.

Head back to Curtis and tell him he's in the clear for 550 xp and 150 caps.

Bugs

 * The main problem with Hsu not starting the radio conversation during "investigate the late night break ins" is due to the player entering the control tower before 1200 am. Unlocking the door to the tower with the key is the trigger event, therefore entering before hand can cause the game to not allow you to eavesdrop the conversation and the spy will eventually discover you.


 * If the player kills Curtis and ignores the "report to Colonel Hsu" objective, it is always impossible to enter the monorail car and defuse the bomb.


 * sometimes after Crenshaw has been framed, Curtis will stay in the control tower attempting to report in. Talking to him will result in his usual response when you discover him in the tower. A possible fix for this is to sleep in an owned bed for 24 hours. Another possible fix is fast traveling to the entrance of Camp McCarran, which corrects his location.


 * There is a bug when trying to eavesdrop on the conversation causing Victor to appear randomly standing on the steps blocking your way. No conversation is held by the NCR on the radio, thus causing the monorail to explode no matter what you do.


 * After successfully entering and eavesdropping on the spy, leaving the control tower causes any followers to stop following. They will wait in front of the tower until you talk to them and tell them to stop following and then to follow you again.


 * Upon entering the tower, followers get stuck in an endless loop of appearing a few feet above the ground, settling on the ground, and then reappearing back in the air again. Upon exiting, followers will try to follow you but upon hitting some kind of invisible wall will be teleported back to the door. The latter is solved by simply walking away, causing the wall to disappear and allowing followers to continue following normally.


 * It is possible to get the 100 Cap reward for framing Private Crenshaw unlimited times, all that is required to do this is to talk to him and tell him you found out who sabotaged the monorail and provide him with the speech check as evidence. Once you have done this repeat to keep getting the 100 Cap reward. This continues to work even after the quest has been completed.


 * While investigating the late-night break-ins, the game does not allow you to eavesdrop the conversation and the spy will eventually discover you. A possible workaround for this situation is to make a save outside the radio tower after the spy enters it - if you hear the conversation when you go in, the quest can continue normally. However, the conversation will stop every time the spy has to give a reply. There are two ways to fix this. Firstly, you can pause the game every time the spy has to reply to continue the conversation. If this does not work, you must pickpocket one item from him for every reply. It's best to take weightless items, such as his the 2 codes and 9 9mm cases he is carrying, which can be taken with a Stealth skill of 20. Each item you take will result in the conversation advancing.Another way of advancing the conversation is to enter and exit you pip-boy.


 * There's a bug which prevents you from saving the monorail - even if you get on the monorail and disarm the bomb, the monorail still blows up (still unfixed even with the latest patches for all consoles). Hence, if the player wishes to access The Strip easily through the monorail, they should do so before initiating this quest OR before the portion of the quest where the player has to save the monorail. However, this bug can be avoided if the player simply kills Curtis, loots the deactivation codes from his corpse, and ignores the "go inform Hsu" objective, instead heading straight to the monorail. Once there, you can deactivate the bomb without any complications and can proceed with the quest as normal.


 * There is a chance that when you are waiting for Curtis to enter the tower, he will simply walk in and out of the McCarran Terminal Bulding every second from 12am to 2am. If this happens, you will have to load a save from an earlier point in the quest, such as before receiving the lead from Carrie Boyd. If you don't have a previous save, PC users can type in the console, erasing the quest. To restart the quest, you will have to speak to Hsu again. An alternative workaround is to crouch down and shoot at Curtis when he exits the building. If done correctly, he will begin to follow you, lead him to the tower and wait in front of the door till hes just about in conversation range. Go inside the tower and watch the compass. When he's right outside the door your companion's indicators and your companions will start to blink. Exit the tower and you will immediately be forced a dialogue with Curtis. Work through the conversation and when done he will enter the tower. Follow behind him and the quest will continue as normal, allowing you to eavesdrop on the conversation.


 * If you end this quest without saving the monorail, Hsu will not grant you the reinforcements for Bitter Springs, thus making the Quest No, Not Much unsolvable. However, reaching Liked status with the NCR allows Hsu to send the reinforcements before completing this Quest.


 * If you quicksave just before Curtis enters the tower and then reload, Curtis remains standing exactly where he was when you saved, but is invisible and will not respond to either speech or pickpocket attempts. A partial fix is to head back into the terminal building and wait till daylight hours. Curtis will reappear and you can now interact with him, but he will remain in position, thus never heading into the tower and making the quest unsolvable.


 * Curtis will not talk to radio and attack you when seen with no dialog.


 * When entering the tower Curtis will be at the entrance not talking to the radio, this makes it impossible to save the monorail.


 * If you decide to leave the tower when you're supposed to listen to the conversation and fast-travel to another location, after ~3 hours Curtis will appear and ask you what you are doing there (in another language with normal subtitles). If you end the conversation well, he will travel back to the camp. However, you will not be able to listen to the conversation after this.


 * If you're on bad terms with the NCR and initiate this quest as a Caesar's Legion supporter, then get on good terms and speak to the Colonel about completing the quest for the NCR. The explosives in the trash can become non-existent and the Control Tower becomes vacant.


 * Sometimes no matter what time or day you're there, the spy will never show up. A possible solution is to reload an earlier save.


 * If Boyd got locked in the interrogation room during Silus Treatment, you will be unable to speak to her to complete this quest.


 * If Curtis starts a gun fight with you in the tower, 10 of Spades may suddenly appear out of nowhere.


 * Sometimes the game will bug and not allow you to open the garbage can in front of the ticketing counter, thus rendering the quest impossible to complete.


 * If you need Col. James Hsu to send troops to Bitter Springs for the quest "No, Not Much", when you get to the monorail part, get into the monorail and defuse the bomb. Then, while still in the monorail, quick travel to Fort McCarran. You should be able to go straight back to Col. James Hsu and ask him to send troops to Bitter Springs, and he'll say yes. If you go back to the monorail, it'll depart and explode. This a small workaround if you need to get the "No, Not Much" quest completed without the monorail blowing up.


 * After defusing the monorail bomb and reporting Curtis as the spy to Hsu, returning to the monorail results in NCR personnel becoming hostile.


 * After discovering the break-ins in the control tower you have the option to inform Curtis about it. If you do this the quest will glitch, Curtis will enter the tower as normal but you'll never hear the radio conversation, preventing the quest to be completed. Note: Confirmed on PS3 but it's doubtful that this is a bug. Informing the culprit that you know would most likely cause the quest to go this way. The quest can still be continued by confronting Curtis in the tower.


 * There is a chance that the explosives will not be in the trash can by the ticket counter.


 * You may not be able to communicate with Boyd to continue the quest if you kill Silus when you first enter the interrogation room. Specifically, this happens when you successfully convince Silus you are working for Caesar through a series of Intelligence checks and then continue to attack him after Boyd asks you to leave the room while Silus is no longer aggressive. It appears Lt. Boyd is no longer able open any dialog with the player after this. This can be fixed by resurrecting Silus through the Console and speaking to him again (you might need to use the Console to unlock the interrogation room door). If your Speech is over 50 you should get a dialogue option to threaten to beat him up. If you select that option Silus will turn hostile but will not attack you; simply kill him again and leave the interrogation room. Boyd should be outside and you can talk to her again.


 * You may not be able to enter the Monorail because of a invisible wall glitch before you inform Hsu, to prevent this problem you need to inform Hsu that you killed Curtis and then proceed to the monorail as fast as you can, however there is a good chance you won't get there in time, thus causing you to fail the Quest. Alternatively you can restart the quest by using in the console on PC to fix the glitch and allow you to walk onto the monorail.


 * If you help the Legion blow up the monorail but do not have a high enough Speech or reputation level with the NCR for them to help you, you have to go back to Curtis and say "Hsu won't let me help". Curtis then tells you to rig the monorail to explode regardless. However, a glitch may mean that you can't plant the bomb, making the quest impossible to complete. The monorail can still be used to travel to The Strip.


 * If you kill Curtis and then report to Hsu, choosing the 'You won't have to worry about intelligence leaks' dialogue option will render the quest impossible to complete; upon defusing the monorail bomb, the monorail acts as though it detonated and can not be used to access The Strip. Upon returning to Hsu, there are no further dialogue options available. The only fix for this problem is to reload an earlier save.


 * After you start the quest make sure to get the key to the control room from Boyd before starting the interrogation, interrogating Silus and kill killing him will make Boyd impossible to talk or pick-pocketable. Making this quest impossible because she gives you the key to the control room.


 * If you kill Crenshaw before the proper stage in the quest you will be sent to do so at the proper stage, but will be greeted by his cadaver (or pieces of it) standing/ floating in the spot where he died, but he will still be dead. This effectively freezes the quest, and forces you to revert to an earlier save to finish it.


 * If you are helping the Legion, sometimes after you plant the bomb on the monorail, the monorail will not leave the station rendering the quest useless; reloading will not help. Please see the "Fixes" section for a solution to this issue.


 * If you started the quest from Hsu, you can still "start" Inculta's side of the quest, effectively exposing the plan to blow up the monorail long before you would normally find out (if you are following the NCR's side of the quest). By the end of the quest, attempting to disarm the bomb will instead force you to plant it, regardless of a bomb already clearly being there. The vent then can then be clicked again, ultimately disarming the bomb (that you perhaps just planted!), leaving the train will cause it to speed off and explode (perhaps because the bomb you disarmed was the Legion's bomb, not your own), but you can return to Hsu and tell him of Curtis' "attempted" plot, regardless of the fact that the monorail just exploded. You then complete the quest, but funnily enough you will still have an option to tell Hsu who blew the monorail up. This dialogue option is useless however, as the only options are to "double check" or to leave. Even more strangely, upon returning to the monorail, is was indeed blown up, however you could still activate an "invisible" monorail where the now destroyed one used to be. This will still take you to New Vegas and back, but the monorail can still be seen humorously as a burning husk on the rail. (needs verification, specific actions in the quest may have led to this contradicting ending.)


 * When you disarm the bomb on the monorail, you will not have the dialogue option with colonel HSU to finish the quest.


 * When you're working for the Legion and you go to the tram it displays: "Take Monorail to The Strip", which makes it impossible to enter the monorail.


 * If you go into McCarren around 11pm you can see Curtis walking from his office towards the exit, you can then follow him outside, but as soon as you are outside he notices and tells you "I hope you catch him" or something similar and walk back into the base, however if you follow him back in and enter conversation then back out again he will walk back to the doors. If you wait 10 minutes before following him out of the door he should have walked far enough for him not to detect you and you can safely follow him.


 * Sometimes when walking into the tower you will not be able to eavesdrop until you have sneaked towards the top of the stairs, without him seeing you.  You will then here a voice saying, "You're too close, shamus" [no capital on Shamus] and immediately the [CAUTION] sign will appear and Curtis will begin looking for you. If you avoid his detection, with a Stealth boy, he will say that he has better stuff to do anyway. However he stays there and when spoken to will become hostile if you imply he is the spy. This means you find no evidence of the bomb planted on the monorail and you will not be able to stop it going off. If you talk to Colonel Hsu and he tells you to disarm the bomb you may be able to disarm it but then a few seconds later the monorail still leaves and explodes, despite the Quest line having told you otherwise.


 * In some cases a bug will occur where Curtis will walk in and out of the Terminal constantly, this can occur due to many other bugs and will also cause the player to be unable to complete the quest even if the player tells Curtis about the spy.

Fixes
If you've killed the spy and already spoken to Hsu about it, but don't want the monorail to blow up, you can follow the steps here to create a mini-mod which would allow you to stop the explosion and complete the quest (not working to everyone, although following these instructions, it may work).

If you don't want the monorail to blow up on the Xbox 360 version, avoid the event trigger. This trick works by jumping up onto the guard rail right next to the train and fallowing it into the train car. PATCHED.

If you have killed the spy without eavesdropping on him, and after you defuse the bomb on the monorail, but you are not given the dialogue option to complete the quest. If you reload a previous save before you defuse the monorail bomb and let the monorail blow up, you get the dialogue option to complete the quest.

If you are helping the Legion, and the monorail will not leave after you plant the bomb on it, travel to New Vegas and ride the monorail back to Camp McCarren from there; when you arrive it will immediately depart and then explode. (Worked for me, need conformation that this works for others)(unconfirmed) didn't work for me it still sits there regardless. I restarted my xbox and reloaded my save right before I planted the bomb. and when I did it, it worked just fine.(unconfirmed) Restarting the xbox works. The train wouldn't take off for me, so I restarted my xbox, loaded it where I'm about to plant the bomb and the monorail took off and exploded. (Unconfirmed- monorail just sits there for me.- worked for me.) If you lost your auto-save, all I did was go back into McCarren and shut off my Xbox and loaded up my auto-save in McCarren and went back outside and it left.

Installing the game to your hard-drive on the Xbox 360 version should prevent a majority of the bugs in this game. It is suggested if you have enough memory on your hard-drive.