DCI Kelso Strang is led to believe that something very odd is going on around the prosperous fishing port of Tarleton on Scotland’s south-east coast. Firstly, a young Detective Inspector is traumatised after witnessing a doctor throwing herself off a cliff, and accusations of extortion have riven the local community. And when the ugly death of a young farmer sets off a murder investigation, Strang finds himself caught in a spider’s web of criminality.

Detective Chief Inspector Harry Grimm is forced to take leave from Bristol’s Major Investigations Team when his boss, tired of Harry chasing the ghost of his murderous father, sends him north on secondment. Used to city life and high stress, Harry fears his life will now be spent handing out speeding tickets, finding lost sheep, and directing tourists. But when a local teenager runs away, Harry finds himself pulled into an investigation much worse than anyone could have ever expected.

Met cop DI Rob Marshall is hot on the trail of the serial killer known as the Chameleon, who has abducted, tortured and killed a series of young women in Northwest London. As they close in, the Chameleon—who switches identity to get close to his victims—shoots Marshall’s partner and escapes.

Disgraced Detective Dave Slater is stuck on gardening leave, down in the quiet Hampshire town of Tinton, with just one last chance to redeem himself. He must search for mousy young journalist Ruth Thornhill. Months ago, she vanished from her home, her London job, her life. But the Met don't want to know. Now Slater's boss slips him the file, asking him to investigate discreetly, with the help of an unlikely new assistant. Bedraggled fifty-something Detective Norman Norman.

Hogmanay. New Year's Eve. A dead teenager, another missing. One hell of a case. Meet DS Vicky Dodds. Settling down for a nice Hogmanay with her daughter and her best friend, a phone call pulls DS Vicky Dodds into work and to a deadly new case. A teenage girl, her body cooling in a cold, dark supermarket car park. Found next to her friend’s car, but the driver’s missing too — has the killer taken her? Or is she the killer?