Strictly Business

Strictly Business is a side quest in Fallout 3. It is also a PS3 trophy and Xbox 360/PC achievement.

This quest will begin the first time you approach Paradise Falls.

Grouse will address you and tell you that you cannot enter Paradise Falls unless you have business there. He will offer to let you in only if you go and enslave select people from his "VIP list". You will be allowed into Paradise Falls after you have enslaved at least one VIP.

This quest involves enslaving several characters for the slavers of Paradise Falls. Enslaving is done with the Mesmetron and a slave collar, which you will get from Grouse. Along with it come the notes slave collar instructions and List of "recruits" for Paradise Falls as well as the holotape Mesmetron manual - summary page. Make sure to return to Grouse after each slave to collect a new slave collar for the next one.

Your VIP List
The characters that have to be enslaved for the slavers are the following:
 * Flak from Rivet City
 * Red from Big Town
 * Susan Lancaster from Tenpenny Tower
 * Arkansas from Minefield

If Red, Susan, or Arkansas are dead before the quest is given, they will not appear on your list, and Grouse will allow you to enter Paradise Falls.

Arkansas
Arkansas is sniping from a ruined building in Minefield. Be careful as you make your way through the town, as land mines are scattered all over the town. Arkansas will also shoot at cars, which can explode and kill you. (Note: If you kill Arkansas before obtaining this quest, he will not be on the VIP list.) The best way to take Arkansas down is to wait for him to get off the building and run around, then chase after him and V.A.T.S him with a strong melee weapon such as a sledgehammer. Once Arkansas starts running to Paradise Falls, go in the opposite direction of him and fast travel as soon as possible, or he may trigger his own landmine on his way out (assuming you didn't disarm them all).

Susan Lancaster
Susan Lancaster may be found on the Third floor of Tenpenny Tower in her penthouse suite (at night). Simply shut the door, mez, and collar. If you have found the note left in her room revealing the possible affair between her and Edgar Wellington II and then show it to Millicent Wellington, Millicent will kill Susan and you will not have to enslave her. If Susan is your last target, the quest will be completed as soon as she dies.

If you enslave Susan while others are present, then the whole tower will be on alert and come after you with deadly force. Try and do it discreetly, or follow the note and affair scenario.

Red
Red can usually be found in her clinic. If she's not there, try walking around a bit and then enter her clinic again. If you did not complete the Big Trouble in Big Town quest yet, Red is captured by super mutants and held in the Germantown Police HQ. You can simply enslave Red there, but it will prevent you from completing the Big Trouble in Big Town quest unless you rescue her from Paradise Falls later. It is possible that she will get killed by a super mutant attack after completing Big Trouble in Big Town and you will not have to enslave her.

Flak
Flak can be found in his room on the Upper Deck (at night), and is probably the most difficult VIP to capture. One strategy that can be used: Wait outside his room until about 10pm then follow him to the dead end by Doctor Li's room. Make sure there are no guards, then mezz him. Exit stage right into the lab before he sees a guard. You should be safe after this. Another strategy (If you are doing the quest for the achievement only) is to save, mezz Flak anywhere in Rivet City, flee the city, finish the quest to earn the achievement, and reload from the previous save.

Also another strategy is to mezz him right at the Market Place entrance. (Right before he enters the Market Place) He will then run for it through that door & you will never get caught. He goes that route about 6AM. If you wait inside his room for him to appear, he will not come into the room.

Or you can pick the lock to his room at night (around 10pm) and close the door; if he's not there, wait for an hour, and he'll appear in his room then just mezz him.

Alternately the player could steal enough inventory from his shop in Rivet City, forcing him to venture out into the wastes. From there look for his marker on the map and mezz him out in the wasteland.

Bugs

 * If you enslave and order a victim to go to Paradise Falls, and then die/reload previous save, the character you've enslaved before you reloaded the save may appear in the Paradise Falls slave pen, without a slave collar on, and with all of the dialog options they normally had (for instance, you can still trade with Flak in the slave pen if he does not have a slave collar). Reloading the save will not fix this problem every time, so you may have to somehow get the target to come near you in the slave pen where you are able to Mesmerize and fit a collar onto the target. If Arkansas was the target, he will pull out his sniper rifle and begin shooting everyone around him.
 * When mezzing a person in V.A.T.S. with the Mysterious Stranger perk active, the Mysterious Stranger may appear. The Mysterious Stranger will look and move around, but no gun shots will be fired. If there is another enemy close by, however, the Stranger will shoot them instead.
 * You may be able to get paid multiple times for each of the VIP slaves you've captured. After getting paid the normal money when you reach Paradise Falls you can pickpocket a key to the slaves pen. After talking to each of the VIP slaves you captured, you can return to the Paradise Falls entry and talk to Grouse and collect the 250 caps reward for each VIP slave you talked to in the slave pen. Grouse will repeat his speech as if you had just captured one of the slaves. If you finish the dialog with Grouse and talk to him again he will then repeat his speech for one of the other VIP slaves you spoke to in the slave pen. You can repeat talking to Grouse for each VIP slave spoken to in the slave pen collecting the 250 caps reward each time you speak to Grouse for a total of up to 1000 caps at a time if you have and spoke to all four VIP slaves. It is possible to repeat this glitch for an unlimited amount of caps.
 * If you enslave Flak, Shrapnel may disappear from Rivet City. He will return only once in a long while (every few days/weeks). He can be seen wandering the wastes and even in Paradise Falls likely looking for Flak. Apparently, Shrapnel's wandering after you enslave Flak is caused by an AI script that says the two should sleep near one another. Enslaving Flak thus causes Shrapnel to wander the wasteland trying to get to him.
 * Sometimes everyone in Rivet City will turn on you when enslaving Flak. If you die in the encounter, Flak will wander the wasteland when you re-load your save. All dialogue will be normal as if he was still in Rivet City selling goods. This will usually cause Red's removal from your quest list and all people of Big Town will be found in a pile dead with only the robot roaming around.
 * If you enslave Red right after you freed her from the prison and fast travel to Paradise Falls, it will complete the task "bring back Red to Big Town" and "enslave Red from Big Town" at the same time, if Strictly Business and Big Trouble in Big Town are both quests in your Pip-boy. However, after you fast travel back to Big Town you can see Red on her way to Paradise Falls, you can remove her slave collar and then ask for your reward bringing her back to Big Town.

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