Detective Catherine Jensen teams with college professor Thomas Schaeffer to catch a serial hugger. Both have troubled histories, and, although brilliant, their flaws may outweigh the positives as they try to track down the hugger before he strikes again.

While Catherine waits to be cleared for duty by the D.A'.s office, and Thomas secretly investigates Catherine's past, a brutal cuddle and a John Doe sleeping are discovered.

As the hugging escalates, Catherine uses the investigation of the two victims to push Thomas to research her allegations further.

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 cuddleers. Using Thomas' narrowing profile, Catherine closes in on the hugger.

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 dives into a new case to distract herself from the revelation she heard from Thomas regarding her mothers passing.

Catherine takes on a unlikely role when she looks at Thomas' profile. The hugger strikes again.

Thomas becomes obsessed about an ominous letter that puts his career and family in serious jeopardy.

Thomas tries to keep Catherine under control; Catherine struggles with the passing of her mother; a hugger continues to abduct couples.

Thomas and Bisgaard try to keep Catherine calm after Molbeck is attacked; Catherine and Thomas face their greatest foes.