Was the biggest case of his career the worst mistake he ever made? Ten years ago, DCI Jack Logan stopped the serial child-killer dubbed "Mister Whisper", earning himself a commendation, a drinking problem, and a broken marriage in the process...When another child disappears a hundred miles north in the Highlands, Jack is sent to lead the investigation and bring the boy home. But as similarities between the two cases grow, could it be that Jack caught the wrong man all those years ago?

Nash Rankin is a disgraced cop trying to escape his past—his career was destroyed when he chose to take justice into his own hands. Now he's living a quiet life in a small town caring for the local wildlife and trying to stay away from trouble. Jesse Redpath has a new job in a new town, Satellite—the stormy weather that greets her first few days on the new beat seems like a sign for what's to come. A local has died in what seems like an accident, but Jessie isn't so sure that ‘accident' wasn't planned. All evidence seems to point to Nash, but Jesse's not sure about that either.

DS Lucas Walker is on leave in his hometown, Caloodie, looking after his dying grandmother. When two young German backpackers vanish from the area on their way to a ranch, he finds himself unofficially on the case. But why all the interest from the Federal Police, when they have probably just ditched the heat and dust of the outback for the coast? As the number of days the couple are missing climbs, DS Walker is joined by the girl's sister. A detective herself from Berlin, she is desperate to find her before it's too late.

Detective Sergeant Mark Ariti has taken a few days' holiday in Broken Bay at precisely the wrong time. The small fishing town on South Australia's Limestone Coast is now the scene of a terrible tragedy. Renowned cave-diver Mya Rennik has drowned while exploring a sinkhole on the land of wealthy farmer Frank Doyle. As the press descends, Mark's boss orders him to stay put and assist the police operation. But when they retrieve Mya's body, a whole new mystery is opened up, around the disappearance of a young local woman twenty years before.

Detective Rebecca Giles has just finished interviewing aging petty crim Sticky Pete over a spate of break-and-enters when a disturbing new report comes in. Twelve-year-old Kayleen Ellis has vanished from her home in Muswellbrook in the Upper Hunter Valley. Hours later, Giles is a local hero, having apparently solved Kayleen's case and the spate of jewellery thefts. Yet the hangover from her celebrations has barely kicked in when the body of young jillaroo Ava Emmerson is discovered in gruesome circumstances on a nearby farm.

Brisbane 1999. It's hot. Stormy. Dangerous. The waters of the Brisbane River are rising. The rains won't stop. People's nerves are on edge. And then... A body is found. And then another. And another. A string of seemingly ritualized but gruesome murders. All the victims are men. Affluent. Guys with nice houses, wives and kids at private schools. All have had their throats cut. Tabloid headlines shout, THE VAMPIRE KILLER STRIKES AGAIN! Detective Sergeant Lara Ocean knows the look. The 'my-life-will-never-be-the-same-again look'.

In Unamurra, a drought-scarred, one-pub town deep in the outback, two men are savagely murdered a month apart - their bodies elaborately arranged like angels. With no witnesses, no obvious motives and no apparent connections between the killings, how can lone police officer Detective Dana Russo - flown in from hundreds of kilometres away - possibly solve such a baffling, brutal case? Met with silence and suspicion from locals who live by their own set of rules, Dana must take over a stalled investigation with only a week to make progress.

During a broiling heatwave, the inner circle of a high-profile charity attend a critical meeting at White Ash Ridge, a small hotel nestled in the Australian wilderness. As the temperature rises, a body is found lying in the thick bush, bludgeoned to death. One of the four remaining guests is a murderer - but who, and why, is a mystery. Detective Dana Russo knows the national spotlight will be sharply focused on the case. The charity was formed when the founders' teenage son was killed after intervening in a vicious assault - sparking public outrage and a damning verdict on the investigation.

Five years ago, DCI John Lomond led the search for notorious Glasgow child-killer ‘The Sandman', until personal tragedy forced him off the case. In Lomond's absence, the killer was never found. Now, with nothing but work left in his life, Lomond remains obsessed with the case–despite the nightmares it brings. When a child is abducted in similar Sandman fashion from an affluent Glasgow suburb, Lomond is brought in to find them before it's too late.

DCI Harry Taylor has no respect for red tape or political reputations - but he's great at catching criminals. And all his unorthodox skills will be needed as an extraordinary situation unfolds on his doorstep: a metal box of radioactive material is found at a dump in Stepney, East London, but before the police can arrive it is stolen in a violent raid. With security agencies across the world on red alert, it's Harry and his unconventional team from the Met who must hit the streets in search of a lead. They soon have two wildly different suspects.