Without Motive

A young woman is found murdered near the city's red-light district. Her husband quickly becomes the chief suspect, but DC Mowbray has his doubts. Meanwhile, the detectives learn about the brutal murder of three prostitutes in nearby south Wales.

A joint investigation into all four murders begins, but questions arise over the competency of the Welsh senior detective.

Jack is deeply affected by the discovery of Laura Wadley's mutilated body, causing him to fear for his family.

The prolonged enquiry is causing problems in the community: men treated as suspects are subjected to violent attacks and marriages are suffering under the strain.

The enquiry into the M4 killings continues to prove fruitless and police morale reaches a low ebb. Jack is interviewed by a counsellor who questions his attitudes to the female victims. Meanwhile, another body is discovered in Bristol.

Mowbray takes himself off the case, goes on leave, and tries to patch things up with Sally and the kids. While he's gone, the police make an arrest. DCS Henderson believes he has his man but needs a confession to be sure.