You can also pickpocket the key off of Alice.

You can probably just crouch by her desk and pick the lock. The safe is fairly hidden and only requires 50 points in Lockpick. The Crimson CaravanвЂ™s part is easy to find. If you want to do things the lawful way, you can gain evidence of their conspiracy. Killing Alice and Gloria will cause Cass to pick up the вЂњHeart of VengeanceвЂќ perk. The benefit is that youвЂ™ll be somewhat hidden away in a side hallway. He wants to kill her, so that will trigger a gunfight. Otherwise, you can advance Birds of a Feather until Jean-Baptise asks for you to bring Cass into the store. He will suicide bomb the store and take care of the problem for you.

Another option is to take up the job of a security guard, but let the last man into the store (the one that вЂњdeclaresвЂќ his revolver). You should probably work with her for a bit under вЂњBirds of a Feather.вЂќ If you do the first quest, sheвЂ™ll trust you as a guard and youвЂ™ll be allowed to bring weapons inside. If youвЂ™ve got a silenced weapon, you can probably just sneak in at night and shoot her in the head a few times without anyone knowing. Heartache by the Number - RevengeД¬ass wants to just kill both of the leaders. SheвЂ™ll tell you that this officially seals the case. Go ahead and loot their bodies while Cass examines it. There are two dead Van Graff thugs and a Crimson Caravan thug. Walk over to the marked location across the bridge to find Durable DannвЂ™s Wrecked Caravan. ItвЂ™s a far ways off to the east of the Strip. ThereвЂ™s just one more caravan to check out. Cass will point out that they were attacked by energy weapons too. Once you make it to the Griffen Wares caravan wreckage, just approach the pack brahmin to trigger another conversation. These guys pack a big punch at any level. You can go around the strip to get to it. ThereвЂ™s another caravan that was hit in the northwest.

It doesnвЂ™t look like a bandit attack, so we have a little more work to do. She should start a conversation noting that she hadnвЂ™t connected вЂњburned to ashвЂќ with energy weapons. You probably already passed it on the road, so just travel to it or a nearby waypoint and walk up to the ruins. Heartache by the Number - InvestigationД¬assidy will want to investigate the ruins of her caravan to pay respect for her men. SheвЂ™ll just ask you to help her out as soon as you recruit her. Once the title has changed hands, she will be recruitable as a companion.Д¬assidy actually has the easiest companion quest, since you donвЂ™t have to do anything extra for her. With a Speech or Barter check, sheвЂ™ll be willing to sell. One of these will involved talking Cass into selling her caravan (which is just burned ash). After you do this, talk to her to get a new set of missions. YouвЂ™ll need to do a quick mission for her and deliver an invoice to Dr. This office is in the Crimson Caravan compound near the Strip.

SheвЂ™ll point you to the Crimson Caravan office if you want some caravan work. YouвЂ™ll probably run into it on the way up to the Vegas Strip. She canвЂ™t offer any caravan work since her caravan was destroyed. You can start it out by talking to Cass in the Mojave Outpost Barracks. You can recruit Cassidy through a bit of a related quest. Heartache by the Number - Recruiting Cassidy

Fallout new vegas how to get companions