In search of a new life, 16-year-old Adriana Clark’s family moves to the ancient ocean-battered Isle of Mull, far off the coast of Scotland. Then she goes missing. Faced with hostile locals and indifferent police, her desperate parents turn to private investigator Sadie Levesque. Sadie is the best at what she does. But when she finds Adriana’s body in a cliffside cave, a seaweed crown carefully arranged on her head, she knows she’s dealing with something she’s never encountered before.

Elspeth, Meggy and Xavier are locked in a flat. They don’t know where they are, and they don’t know why they’re there. They only know that the shadow man has taken them, and he won’t let them go. Desperate to escape, the three of them must find a way out of their living hell, even if it means uncovering a very dark truth. Because the shadow man isn’t a nightmare. He’s all too real.

On a remote Highland mountain, the body of Elaine Buxton is burning. All that will be left to identify the respected lawyer are her teeth and a fragment of clothing. In the concealed back room of a house in Edinburgh, the real Elaine Buxton screams into the darkness…. Detective Inspector Luc Callanach has barely set foot in his new office when Elaine’s missing persons case is escalated to a murder investigation. Having left behind a promising career at Interpol, he’s eager to prove himself to his new team.

When a 15-year-old girl fails to make it home after school, DI Heather Filson believes she’s dealing with just another teenage runaway. The girl’s grandfather, a notorious Glasgow gangster, disagrees. Convinced one of his underworld enemies has grabbed her, he’s prepared to bathe the city in blood in order to bring his princess home.

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?