Marcella Season 4 is yet to be announced by Netflix, ITV1

Marcella has no time to lose as the killer has Edward. Following leads she races to the killer's house, but finds it empty except for a ringing phone. However, a premonition offers up clues, but can she get to her child before it is too late?

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.

The arrest of Vince Whitman causes massive fallout between Tim and Marcella. Meanwhile, Postfeed24's internet viral video leads the team to discover another body much closer to home.

Kevin Hoffs and his blue lorry are found abandoned in a lay by. Leann informs Marcella that the lorry had been there for 36 hours.

After analysing Adam's phone records, the team become aware that Adam had contacted the KidsCall helpline. Marcella heads there to retrieve the records and Maya is helpful despite both women having Tim Williamson in common. From Adam's records they see that he'd admitted to being abused by his father but his father has alibis for many incidents surrounding the case.

Adam gets away from the killer's prison but loses consciousness while trying to escape in the car of an elderly couple. Meanwhile, Marcella confronts Reg about a binder that was stolen from his house, while Phil sets his sights on the detective.

Marcella digs deep in her attempts to take down Phil Dawkins, but her dogged pursuit has tragic consequences, causing her to question everything. Meanwhile, her ongoing blackouts mean she has to face up to the threat of losing her children.

Marcella decides to return to the root cause of her blackouts. Meanwhile, the discovery of another body leads the team to question what type of killer they're dealing with.

Five months after the events of the last series, DS Marcella Backland is called to a house where a workman has drilled through a wall and discovered an ear. When the wall is taken down, Marcella is horrified to discover that the ear belonged to Leo Priestley, a 7-year old boy who's been missing for four years and who knew her son. Leo was meant to walk home with Edward, Marcella's son on the day he went missing.

Leo's discovery puts Marcella in confrontation with a previously convicted child abuser, Phil Dawkins. Dawkins is open to Marcella about being a non-practising paedophile – his urges are deemed unacceptable by society and he takes precautions to control them. Following his release from prison he's tried to move on to an acceptable life but Marcella struggles to move past Phil's admission.

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 targets a six-year-old girl, which devastates Marcella.

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.

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.

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.

The Gibson family are in a state of panic when Grace is discovered missing, and Marcella tries to make sense of the previous evening's events, scouring CCTV footage in an attempt to discover more about her disappearance. Cara returns home from her latest job, in which she has stolen a watch, some earrings and a bracelet, but is unaware of their significance and the danger she's put herself in, with all of the items recognisable as trophies taken by the Grove Park Killer.

After 11 years' absence away from the force, DS Marcella Backland finds herself drawn back to police work following the return of the Grove Park Killer, her last case before she left to start a family. In 2005, the killer tied the victims' hands and feet with cable ties before taping a plastic bag around their heads. The case went cold. But now, over ten years later, it seems he has returned.