Find Collar 12: Christine

 is a quest in the Fallout: New Vegas add-on Dead Money.

Overview
This quest is given to you by Father Elijah after completing the quest Sierra Madre Grand Opening! He instructs you to recruit three companions in order to perform a heist against the Sierra Madre casino.

Quick walkthrough
Find the Medical District.

Enter the Villa Clinic.

Enter the Clinic Basement (lockpick 75) or by using the key located in a desk on the second floor.

Turn off the Shielded Speakers by using the terminal in the Clinic Basement.

Find Christine in the malfunctioning chamber. Recruit her.

Detailed walkthrough
Enter villa clinic, on the wall to the right there is a terminal. Set the hologram behavior to the first floor, and go left up the stairs past the hologram.