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A pair of detectives investigate stalkers in Los Angeles. Strong and focused, Lt. Beth Davis is an expert in the field of repeated harassment, driven by personal experience of being a victim. She heads the LAPD's Threat Assessment Unit, which investigates cases of stalking -- including voyeurism, cyberharassment and romantic fixation. The history of recent transfer Jack Larsen -- whose personality and questionable behavior have been an issue in the past -- may help him in his assignment to her team. Her other detectives are young but eager Ben Caldwell and deceptively intelligent Janice Lawrence. Together they try to stop situations from spinning out of control -- and to keep their personal obsessions at bay.
LAPD’s Threat Assessment Unit’s Lt. Beth Davis and Det. Jack Larsen search for a stalker with an affinity for fire. Beth meets with an exasperated college student who claims his former roommate is aggressively harassing him.
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.
When a bride is shot by a sniper during her wedding ceremony, Jack and Beth are called in to determine if her stalker has come back to haunt her.
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.
While investigating a series of eerie threats, the TAU team discovers the victim’s house has a creepy history and is believed to be haunted. When the danger turns deadly, they spend Halloween night searching a wild costume party looking for a perpetrator long believed to be dead.
After a series of alarming occurrences befall a wealthy philanthropist, the TAU investigates her beleaguered ex-husband and his much younger girlfriend. Amanda threatens to reveal Jack’s dark past.
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.
When a man's quiet suburban neighborhood and home are vandalized and his family is terrorized, he is forced to reveal his nefarious past to secure protection from the Threat Assessment Unit.
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.
An athlete's estranged wife is terrorized when her tell-all memoir is about to be released. Meanwhile, Beth sheds light on her painful past.
After the Mayor is victimized by a stalker, the TAU must determine if he is being harassed by one of his angry constituents or if a scandalous secret from his past is coming back to haunt him.
After a violent break-in at a popular anchorman’s home, Beth and Jack immediately investigate his previous stalker, but quickly learn it is a far more convoluted case. Meanwhile, Perry gets more insight into Beth’s past.
When a mysterious stalker targets a lifeguard (Phoebe Tonkin) and her loved ones, Beth and Jack race to diffuse the threat.
When a popular high school coach claims he was attacked by a student with a crush on him, Beth and Jack investigate. Meanwhile, Ray brings Perry into his plans to destroy Beth.
When a young woman is harassed by a mob of people, Beth and Jack realize they are dealing with a rare case of group stalking. Also, Ray escalates his plan to isolate Beth from her closest allies.
Beth's former stalker methodically moves in on her, targeting those close to her in a deadly rampage.
Beth desperately fights for her life after her deranged stalker drags her to a remote cabin in Ojai, leaving Jack and Janice to frantically search for clues to their location. Also, the TAU waits for updates on Ben’s prognosis after he was shot.
Beth must make a tough decision about her future with the LAPD, while the TAU team investigates a suspect who could be linked to a string of recent murders. Also, Vicky’s ex-husband, Will, surprises her at work, prompting her to reveal to Beth the real reason she returned to Los Angeles.
Series Finale - Beth, Jack, Vicky and the rest of the TAU team continue their search for a serial killer, and Vicky learns some startling information about her ex-husband.
