In the final episode, Dinah clashes with Deering, setting off an irreversible chain of events, and an attempt to save the lives of a mother and baby goes disastrously wrong

The fatal shooting of a respected surgeon leads the team to an unlikely suspect. Meanwhile, Dinah and Deering make disturbing new discoveries in the serial killer case, fearing it might not be over.

Deering leads a manhunt through Manchester as the net closes in on the serial killer. Meanwhile, Joy and Spike discover an unsettling slavery case after a brutal attack on a young homeless man.

As Paul Abbott's procedural saga continues, there's no shortage of fresh problems for DI Vivienne Deering and her team. The police are readying a trap for the prime suspect in the serial killer case, but their best-laid plans soon come unstuck. The long-suffering law enforcers risk their operation being derailed entirely when a notorious child murderer's new identity is leaked online, so the team have to come up with a new approach - and fast.

The search for another girl abducted by the serial killer leads to a big breakthrough.

Dinah attends to a man who walked out in front of a car to commit suicide, but the case becomes more complicated when the police inform the next of kin. Viv's team desperately searches for a missing girl, concerned she may be the serial killer's next victim.

The serial killer is showing no signs of slowing down, while local racial tensions are also running high when an Asian woman is killed in a suspected racist attack

After Deering and her team lose the serial killer case to Maclaren, the cops see a chance to redeem themselves by investigating a dangerous new street drug.

Dinah invites Cathy, the girl she saved, to stay at her house, but their arrangement causes trouble for the investigation. After watching a teenager overdose, Viv and her team trace a bad batch of drugs to a wealthy couple.

DI Deering and her team must crack the case of a twisted serial killer - by whatever unconventional means possible.

After a harrowing experience, DC Dinah Kowalska learns she's on the shortlist for a promotion from her no-nonsense boss, DI Vivienne Deering. Later, Dinah connects a body at the morgue to a series of murdered girls with Down's syndrome.