Copycat

Dr. Helen Hudson is cornered in the university lecture hall restroom by her escaped subject, Daryll Lee Cullum. He kills a police officer and brutalizes Helen before a local officer subdues him and re-captures him. The assault leaves Helen traumatized and sets the stage for her agoraphobic withdrawal.

In the wake of the attack, Helen becomes severely agoraphobic and secludes herself inside her large apartment. She conducts her life through a computer and is supported by her live-in assistant, Andy. The world outside the apartment becomes a dangerous unknown she refuses to face.

A string of similar murders spreads fear across San Francisco, drawing homicide detective M.J. Monahan and her partner Ruben Goetz to seek Helen's expertise. Public danger forces the team to turn to the woman who studied serial killers for insight. Helen is reluctantly pulled back into the case.

As the murders escalate, the killer draws inspiration from famous killers that Helen lectured about, including Albert DeSalvo, The Hillside Strangler, David Berkowitz, Jeffrey Dahmer, and Ted Bundy. The killer seems to be following Helen's lecture map, reinforcing the connection to her. The threat becomes a game of wits between hunter and subject.

The murderer begins contacting and stalking Helen directly, and Cullum offers his knowledge of the killer to help locate the next strike. The cat-and-mouse game tightens as Helen's safety becomes a concern. She is forced to confront the return of danger she thought she had escaped.

During an unrelated incident at the police station, a suspect gains access to a gun and takes Ruben hostage. M.J. shoots the suspect in the shoulder, but the man recovers and shoots Ruben in the chest with his left hand, killing him. The episode deepens M.J.'s guilt and resolve.

The officers are unable to intercept the killer, and M.J. decides to continue the investigation by herself. She focuses on the killer's pattern and the copycat's next move. The tragedy steels her resolve to pursue the case solo.

Helen realizes the copycat will follow the list in the same order and suspects the next murder will imitate Jeffrey Dahmer. The team races to anticipate where and when the next Dahmer-like act will occur.

A killer abducts Andy from a club and murders him in a Dahmer-esque manner, confirming the copycat's grim pattern. A witness later ties the killer to Peter Foley.

A witness identifies the killer as Peter Foley, a man known to the police for corresponding with Cullum. The identifying evidence connects Foley to Cullum's influence.

M.J. reaches Helen's residence to find that Foley has kidnapped her and left a video taunting M.J. to guess where she is. The stakes rise as Helen becomes the focal point of the killer's game.

M.J. returns to the lecture hall restroom and discovers Helen bound, hanged, and gagged in the copycat's reenactment of Cullum's crime. The confrontation forces M.J. to confront the killer and rescue Helen in a high-tension moment.

Foley shoots M.J. in the chest, though she wears a bulletproof vest, and closes in on Helen. Helen tries to sabotage Foley's crime scene by hanging herself, hoping to derail his plan. Foley cuts her down, and the struggle continues.

Helen escapes to the building's roof, overwhelmed by agoraphobia, as Foley corners her. M.J. arrives and shoots Foley's arm, giving him a chance to surrender. When Foley aims at Helen, she returns fire and kills him with shots to the head.

Some time after Foley's death, Cullum writes to another serial killer, instructing him on how to kill Helen and revealing that he had been aiding Foley all along. The antagonist's manipulations continue beyond the main events.