In the Scottish Highlands where secrets settle like mist in the glens, Detective Inspector James Corstorphine is summoned to a macabre scene–a gamekeeper hanging from an ancient oak, ensnared by an intricate trap of wire and bone. Still grieving his wife's death, Corstorphine finds himself hunting a killer who crafts elaborate deathtraps from human remains–clockwork mechanisms that deliver murder with chilling precision.

In 2007, Cora, Faye, Anna and Julia returned home from a week together in Ibiza with secrets to keep. When they agreed never to contact each other again, all traces of their holiday were erased. Or so they thought. Now, almost seventeen years have passed since that trip and Anna's sister Kim is still picking up the pieces after Anna abruptly abandoned her life to start over in London, the occasional Christmas card her only contact ever since.

When the mutilated body of a young woman is discovered in the desert on the outskirts of Los Angeles, the detective assigned to the case can't deny the similarities between this murder and one that occurred a year prior. Media outlets are quick to surmise this is the work of a budding serial killer, but Detective Bill Renney is struggling with an altogether different scenario: a secret that keeps him tethered to the husband of the first victim.

Together, Edward and Isabel move to London. They are young and in love, occupied by friends, work and fun. But late on a spring evening when they are thirty years old, their home is invaded by a serial killer. In the wake of this violation, each tries to come to terms with a night that changed everything—and their marriage begins to crumble. Twenty-five years later, their tormentor is caught, and Edward and Isabel reunite for his sentencing. Isabel has waited years for the man who nearly ended her life to be brought to justice. Edward has tried to think about anything else.

Showrunner Ethan Harris had a hit with The Murder Show, a television crime drama that features a private detective who solves cases the police can’t. But after his pitch for the fourth season is rejected by the network, he returns home to Minnesota looking for inspiration. His timing is fortunate—his former classmate Ro Greeman is now a local police officer, and she's uncovered new information about the devastating hit and run that killed their mutual friend Ricky the summer after high school. She asks Ethan to help her investigate.