We learn more about Dr. Jane Chu and her strained relationship with Elizabeth, her wife, who is desperate to adopt a child. 23’s daughter, Tess could be the perfect candidate, as her mother is emotionally dissociated from her and doesn’t recognize her.

Wavering between Elizabeth’s happiness and her ethical obligation to cure a patient,  Dr. Chu tries another P.A.T. session with 23, but again, instead of recovering her own memory, 23 slips into the mind of a Valerie Harper, a computer scientist at CERN, who once was a gifted coder, but lost her abilities and is part of a highly anticipated experiment currently conducted at CERN. 

 Dr. Chu remembers an inventory she personally created 20 years ago when she started as an intern at St.Vincent and was responsible of Dr. Sermon’s video archive. After hours of searching, she retrieves the list and realizes that Valerie and Teresa were both Dr. Sermon’s patients, but their recorded therapy tapes are missing, together with 18 others.