Beth, Jack and the TAU investigate after a teenage girl has a stalker break into her house, but quickly realize that she is not the one being targeted. Perry pays Beth an unsolicited visit at work.

Beth and Jack investigate an attack by a stalker who preys on his victims’ phobias. Beth learns a friend is seeing someone who, unbeknownst to both women, has ties to her.

The Threat Assessment Unit investigates the home of a young actress after she is frightened by an obsessed fan. Meanwhile, Beth receives an unsettling personal letter and Perry gains more access into her life.

A psychiatrist believes he is being stalked by a suicidal patient, but the Threat Assessment Unit unravels a tangled mystery exposing the suspect and the great lengths he has undertaken to terrorize his victim. Beth’s private investigation into her own stalker leads to a stunning revelation.

After a series of harrowing attacks befall two seemingly random victims, the Threat Assessment Unit desperately searches for a connection between them before the elusive stalker strikes again.

Beth's former stalker methodically moves in on her, targeting those close to her in a deadly rampage.