Without Motive Episode Rating Graph

A joint investigation begins into all four murders, but questions arise over the competency of the Welsh senior detective. Another murder back in Bristol breaks all the patterns of the previous killings--and comes uncomfortably close to Mowbray's family.

Henderson realizes the killer has to be someone they all know. As Mowbray closes in on a suspect, he alerts his family to the danger. In the end, it's a race to see who can get to their target first.

Jackson is released from prison and seeks to cash in on his celebrity, while the detectives have to sift through all the old evidence again. Finally, they get a breakthrough--a link between the latest killing and one of the Welsh murders.

The investigation into the most recent murder brings about unforeseen consequences in high places. Cracks also begin to emerge in the case against Robert Jackson when Mowbray learns that crucial evidence had been suppressed.

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.

Tensions deepen between Mowbray and his wife, as the police launch their investigation into the latest killing. The murdered woman, a student, worked part-time at a pizza restaurant, where the detectives establish a link with the first victim in Wales.

The police pursue a number of leads, but Mowbray strongly suspects Robert Jackson, a delivery driver with a previous record of violence against women. Mowbray's boss disagrees, however, and the detective must decide whether to charge Jackson.

Another victim turns up, and morale among the investigating officers hits rock bottom. The stresses of the job force Mowbray to consult a therapist, but not before his actions drive Sally away from him. Adding to the pressure, the killer strikes again.