The entire FBI team is under investigation as internal affairs tries to find the mole. Aram is initially suspected, but Red is able to prove he was set up. Meanwhile, a serial killer from Liz's past, "The Good Samaritan" (guest star Frank Whaley), strikes again. Elizabeth is allowed to join the hunt for the killer, as Cooper knows Red will likely realize how much this unsolved case means to Elizabeth and reach out to help her. Soon Elizabeth discovers the victims are all linked through abusing a family member, and that the killer was likely an abuse victim himself. Read More...