Fitz duels it out with the prime suspect while an angry mob builds outside the police station.

A young boy goes missing and is soon found dead in a wood, and Fitz is asked to join the investigation.

Fitz has Tina in custody, but is racing against time to get her to reveal Sean's whereabouts before he kills again.

The search for Sean and Tina is intensified when someone close to Fitz and his police team is murdered.

Tina and Sean are two of societies rejects. Tina hates her parents and has moved out, living in a squat. Sean stutters badly except when he sings or is angry, which is the case most of the time. They meet in a pub one night and become, in Tina's words, just like Bonnie and Clyde. They first murder a local loan shark but then set their sights on one of the detectives looking for them. Fitz brings his insight to the case but continues his testy relationship with the the police. His home life is still in a shambles. He very much wants his wife to move back in with him, but she will only agree if he joins Gamblers Anonymous. There is also a growing sexual tension between Fitz and Detective Penhaligon, which is obvious to both of them.

Kelly is put into Fitz's care after a lack of evidence. But after another murdered woman is found, Kelly is arrested and DCI Bilborough orders Fitz off the case. Fitz and DS Penhaligan collude to find out the truth.

When a young woman is found brutally murdered on a train, the police call in a brilliant but unstable psychologist.