The discovery of slaves on the Pritchard farm has turned a murder inquiry into a huge, multi-agency investigation.

DCI Murray has to choose between Janet and Rachel. When a photo of a young man in the boot of a car appears on Facebook, it looks like he is already dead.

After the body of teenager Will Hudson is discovered in a Manchester park, Rachel is certain that his death could have been prevented.

When Rachel bumps into an ex-juror, she is shocked to discover that the woman had an affair with Nick in the middle of a trial - and a desperately worried Nick does everything in his power to persuade Rachel to keep the knowledge to herself. After a current investigation throws up similarities to Veronica's murder, Janet tells Geoff Hastings that they could be one step closer to bringing his sister's killer to justice. But when Rachel stumbles across some new facts in the case, she realises that Janet is in terrible danger. Can she get the information to Janet in time?

Rachel returns to Syndicate 9 following a year with Vice and she needs some time to rekindle her neglected friendship with Janet. The shocking murder of Michael Edgerton forces her to hit the ground running as she steps up to Acting DI under the watchful eye of Julie Dodson.

Having discovered the remains of several bodies, Gill and Dodson’s teams need to try and identify them, and attempt to piece together the order in which they were murdered. Joe Bevan remains tight lipped though. After the remains of a teenage girl are found in an upstairs room, Helen is faced with the possibility that her dad killed both her brother and her sister.

A body on the moors leads Janet and Chris to a shocking discovery. While Rachel and Janet harbour concerns about Gill's behaviour, their own actions come under investigation.

The detectives investigate the murder of a wealthy man whose double life left him vulnerable to exploitation. Away from work, Rachel's recent moment of indiscretion threatens to come back to haunt her when a confused Sean takes a phone call from her one-night stand, and after Ade is pushed into living with his girlfriend on a permanent basis, Janet asks her mother to move in.

Janet goes on her first date. The murder of a gay man has all the markings of a hate crime, but why is his friend struggling to answer some simple questions?

When a rape and murder case goes to trial, DCI Gill Murray is determined to see the defendant, Georgios Stelikos, convicted. But the case is made more complicated because only one of the alleged victims is prepared to testify. When Rachel gives evidence, she is horrified to discover that her ex Nick is the defence barrister. Nick's cross examination shakes her when he uses information which passed between them when they were together. But as the verdict is delivered, events take a shocking turn.

After businessman Adam Armitage pushes a homeless man, he doesn’t know that he’s killed him, so what is the reason why is he running away? Rachel gets married to a happy Sean, and Janet admits her marriage is over.

Adult movie star Vicky Birkinshaw finds herself being arrested on suspicion of her murdering her husband three weeks after she reported him as having disappeared. Rachel has to go through the woman's home-made pornography collection to look for clues. The case ends up taking a dark twist after Vicky's daughter turns up with an older boyfriend.

After a concerned neighbour knocks on Janet’s door, she can only guess at the horrors about to happen. Rachel wishes she was still single while Janet ends up realising that her own marriage is over.