Former CIA operative Dr. Dylan Reinhart is lured back to his old life when NYPD detective Lizzie Needham needs his help to stop a serial killer.

The murder of a young man who recently left his family's religious community leads Dylan and Lizzie to a series of possible suspects, including a short-tempered photographer and a mysterious girl with amnesia. Also, Lizzie's younger sister, Katie, unexpectedly drops by for a visit.