Detective Catherine Jensen teams with college professor Thomas Schaeffer to catch a serial killer. Both have troubled histories, and, although brilliant, their flaws may outweigh the positives as they try to track down the killer before he strikes again.
Thomas' decision to stop working on active cases causes Catherine to investigate his past, leading her to an unexpected family history. Catherine takes Thomas to the scene of her childhood trauma where she finally reveals all the details that still haunt her.
Catherine is forced go to Howard for more information on the case, while Thomas has a real conversation with John about getting inside the minds of murderers. Using Thomas' narrowing profile, Catherine closes in on the killer.