In her desperate hunt for Matthew, Marcella questions Henry at his home. Meanwhile, the pressure mounts on Jason as Tim's investigation into the murder of Andrew Barnes gathers pace, and the killer is finally revealed, causing shockwaves among the entire team.

Mo confronts Marcella after finding his brother dead, while the detective has her doubts as the police continue to investigate Yann. Tim starts to look into the curious circumstances surrounding the death of Andrew Barnes, bringing him into contact with Jason.

The killer's next victim is a six-year-old girl, which devastates Marcella, and a DNA match gives the police team its strongest lead yet. Meanwhile, DI Tim Williamson investigates Andrew Barnes' death - was it really suicide?

Marcella heads to Nigel Stafford's house to question him. As she walks around the house she finds a small grave before heading inside the unlocked door. Inside she's confronted by Nigel, holding a knife.

An aborted attack on an elderly man gives the police a new lead in the Grove Park killings, while Marcella tries to track down the taxi driver from outside Grace Gibson's house, fearful that he saw her on the night of the murder.

Mo holds the police responsible when Hassan is shot, while Marcella triumphs over Peter Cullen and finally gets the information she is after relating to Grace's death. Jason manages to get his job at DTG back - but at what cost? - and deliveryman Ronnie makes the mistake of his life.

Grace's body is discovered by the police and Marcella tries to keep her head and hide the fact that she was one of the last people to see her alive. Sylvie is distraught at the loss of her daughter and her dismay is further compounded when she learns that Grace and Jason were having an affair, while Henry tries to find comfort with his friends Matthew and Yann. Meanwhile, Peter is released from open prison and makes a beeline for Maddy, who lies to him about having a boyfriend.

Marcella's latest blackout leaves her with an unexplained corpse. Wondering why DCI Sangha is still in Belfast, Jack decides to investigate on his own.

Finn uses Rory's phobia to bully him into an alliance. Marcella confronts Frank with a discovery about his past. DCI Sangha learns of Stacey's arrest.

Marcella recalls how Frank rescued and reprogrammed her 18 months earlier. When Stacey flees from the Maguires with her baby, Marcella must find her.

The discovery of a young boy's body sends Marcella and the team after a child killer.

Eighteen months later, Marcella has a new life as a deep undercover operative in Belfast, spying on a powerful family that's running a shady business.

Dr Fairclough tells Marcella that it might be a good idea to go back to the root cause of her blackouts - Juliet's cot death. But when she tries to relive that moment at her home, the resulting stress levels put her into another fugue state. Meanhile, the team is called out when the driver of a car abandons his vehicle after a fatal collision with a cyclist and police attending the scene open the boot to discover a body surrounded by the same stuffed toys found with Leo.

Marcella is recognized on the street, and later finds an odd note on her windshield. When DCI Sangha arrives in Belfast, Bobby must cover his tracks.