Problems between criminal psychologist Fitz and his wife Judith continue after Fitz is arrested outside his in-laws' house and taken to the station.

There he meets Sean and his partner Tina, car thieves who embark upon a spree of violence.

Whilst on their spree of violence, Tina and Sean murder a police officer.

Criminal psychologist Fitz turns down DS Penhaligon's offer of a bed for the night, but is then approached by Tina who asks him to accompany her to her flat.