Killer Instinct

After debating the merit of the idea, Cassie, Dean, and Briggs go to the prison together. Redding appears pleased to meet Cassie, and she begins asking him questions about the case. At the end of their conversation, Redding unexpectedly states that Cassie will never find the man who murdered her mother. Shaken by the fact that he knows about her, Cassie leaves, followed by Dean and Briggs.

Cassie, Dean, and Briggs meet Sterling, Lia, Michael, and Sloane in the observation room, where the latter have been watching the interview. Although the questions were designed to sort the truth from the lies, Lia reveals that Redding’s conflicting answers about the UNSUB were all true. Sloane therefore realizes that Redding must have two apprentices with contrasting personalities: One is more impulsive and disorganized while the other is highly methodical, which is why the crime scenes differed. While they speak, Briggs receives a call informing him that Clark’s body has just been found. By the time they are back at the house, preliminary DNA tests reveal that Clark was not only the latest victim but also one of the UNSUBs and Trina Simms’s killer.