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.

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.

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.

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.

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.