Without Motive

The detectives feels the pressure when questions arise as to how convicted murderer Robert Jackson has managed to slip through the cracks. Meanwhile, DC Jack Mowbray moves out of the family home.

The team investigates whether the latest murder was a revenge killing. Meanwhile, Henderson and Mowbray now face a manslaughter charge in addition to the civil case brought by Mark Colefax.

Killings compound outside of the courtroom while the officers work on the copycat thriller theory.

Forensic officers begin the grisly task of investigating the murder of Margaret Walkinshaw.

Robert Jackson walks out of prison a free man. Cleared of the M4 murders after the dramatic revelations of police negligence, he's ready to start his life again.

Henderson realises the killer must be someone they all know. Mowbray closes in on a suspect.