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Rachel Bailey and Janet Scott are back for another season. Upon stepping into the position of acting DI, Rachel senses the growing divide amongst her team. With Janet preoccupied by the arrest of her daughter and unable to advise on the situation, the two are left struggling to refocus on the horrific case at hand, the sinister world of Darknet.

Syndicate 9's new Sergeant is thrown in the deep end with a historical missing person's case. Their biggest challenge is to hide their contempt for the poor police work that hampered the original investigation. Janet keeps Gill's secret but shares another secret with Rachel. And when Mandy Sweeting's body is discovered, 23 years after she went missing, the new Sergeant takes on huge proportions.

Gill and Rachel go to Bristol to advise on a rape and murder that has striking similarities to an infamous case from thirteen years ago. But even away from home, Rachel can't escape her personal life.

Retrospective episode set immediately after the events of season two. Rachel faces further accusations of masterminding the fatal attack on ex-lover Nick and finds comfort in the arms of ever-faithful Sean, agreeing to marry him. The detectives also investigate the case of a businessman suspected of murdering a tramp.

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.

Rachel steps up to Acting DI on a case that becomes bigger and more sinister than it first seemed. Glad of Rachel's return, Janet couldn't have known how much she was going to need her friend.

Syndicate 9 are left reeling at the identity of the mole in the team, and when a body is found in Oldham town center, the detective duo discover that a spate of street robberies may lead them to the killer.

As the team makes a significant breakthrough in the case, Rachel's position as Acting DI is jeopardized. Janet's attempt to help Taisie results in a complaint, rocking her faith in justice.

Scott and Bailey investigate the murder of a sexily dressed woman with a green head. And while Janet confides in Gill about Andy's behavior, Rachel struggles with Sean's latest surprise.

Janet is unnerved to discover that DSI Dodson cannot ignore her concerns about Gill's drinking. Just as Rachel feels as if she is getting to grips with the job, she makes a fatal error that puts Janet and Chris in danger. When a man's body is found wedged between rocks on the moors with nothing to identify him, a road block is set up and an appeal put out.