Birds of a Feather

Birds of a Feather is a side quest in Fallout: New Vegas.

Detailed walkthrough

 * 1) First you will have to guard the front door. A series of 5 non-player characters will come up to you, and you must remember to be polite, not allow drunks, and search everyone before allowing them inside. Leaving the area or going a certain distance away from the door will fail the quest. The third customer will require a 65 Speech check to be able to be searched, otherwise you have to be rude to him and deny him entrance. The fourth one will be carrying a bomb. If you choose to let him in, he will blow up the entire store and most of the items displayed as well, including the plasma caster, failing the quest. If you choose to search him, he will attack you, forcing you to kill him. The last person to appear is Pacer (unless he was killed during G.I. Blues or Kings' Gambit), wishing to talk to Gloria, but not doing so and asking you to deliver his message, which will make him mock you, saying what "a good dog you are." You can also choose to tell him "why not tell her yourself" with Simon congratulating you for keeping a cool head (there are no negative consequences in the quest). If you are hostile with him the whole way through, he will then attack you. Once he is dead it will say that the quest is failed, but this is false. Report to Gloria and she will pay 200 caps. If you followed Simon's instructions to the letter, passed the Speech check, treated all customers politely - including the drunk - and agreed with Pacer about speaking with Gloria, she will pay an additional 100 caps.
 * 2) You are given the Van Graff package to be delivered to a man a bit east of New Vegas, who is an undercover Legionary. With a Speech check of 75, you can get 200 caps from the man. Killing the man after the exchange will gain infamy with Caesar's Legion and fail the quest. Also, if you happen to have enemies of any kind nearby when you come upon the man he will flee the area and you will fail the quest.
 * 3) You will need to recruit Rose of Sharon Cassidy as a companion and travel with her to the Silver Rush so that she can be executed by Jean-Baptiste. If you ask Jean-Baptiste where she is, he will tell you to talk to Alice McLafferty in the Crimson Caravan Company Main Office. Alice tells you to check the Mojave Outpost, which is west of Nipton. When you ask Cass if she'll follow you to Freeside, she says she is waiting for her papers to clear. You must first ask her if there is any work available, which will start the side quest You Can Depend on Me. The objective relating to Cassidy Caravans must be completed before Cass will follow you. If you have a human companion with you when attempting to recruit Cass, you will need to split with him/her to allow Cass to follow you. If you bring her to Jean-Baptiste and allow her to die while in dialogue, you will lose her as a companion and fail her companion quest Heartache by the Number. You will successfully finish this part of the quest and receive 350 caps as a reward. Jean-Baptiste will tell you to talk to Gloria, who will initiate the final portion of this quest.
 * NOTE: Once you talk with Gloria, the final part of the quest begins immediately and you will not be able to retrieve any items from Cass's body that she may have been carrying for you. But you can take it from her ashes at the end of the quest.
 * If you end up killing Cass instead of recruiting her, the journal will update to tell you to 'Let Jean-Baptiste know that the Cassidy girl is dead'. Upon returning to him, you will still be rewarded and the quest will end as normal.
 * You can also choose to attack the Van Graffs. Obviously, this fails the quest. Simon, the guard outside, will also be hostile once you exit the building, as well as the Silver Rush crier.
 * Normally, you are forced to either let Cassidy die or fight the Van Graffs as soon as you initiate dialogue with Jean-Baptise, but if you have the Terrifying Presence perk, you can exit the dialogue and take more time before coming to a final decision on how to handle the situation. This option works countless times, but the quest won't continue until a permanent solution is chosen.
 * 1) If you choose to just let Jean-Baptiste kill Cass, then Gloria will ask you to help her with one more thing. A deal with the Legion is going down in the abandoned warehouse, and things might get rough. During the deal, NCR troopers storm in, and together with the Van Graffs, they take out the Legion. The Courier is actually not required to kill any Legionaries, as the NCR and the Van Graffs will easily take care of that. The reward for "helping" Gloria is 1000 caps, Freeside and NCR fame, and the Van Graff combat armor. This battle can be quite interesting if the player has sided with the Legion. Both the ambushed Legion soldiers and NCR forces are hostile, and companions may enter the fray killing both sides and netting both NCR and Legion infamy.

Bugs
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