DI James Walker is ready for a quiet family Christmas in the sleepy village of Kirkby Abbey. But when he opens an early Christmas present left on his doorstep, he soon realises it is no gift. Inside is a gruesome surprise and a promise - 12 days, 12 murders. Not long after, the first body is found, half frozen in the snow. As the blizzards descend, panic spreads through the remote Cumbrian village - there’s a killer amongst them, and with 11 more victims to go, anyone could be next.... Can James stop the killer before they strike again?

DI Tom Stonem’s peaceful holiday is cut short when a body is discovered nearby, in the shadow of the Angel of the North. The dead man is bound, his arms outstretched in the sculpture’s iconic pose. In the man’s pocket is what appears to be a little girl’s Christmas list, with the first item – 1. Angel delight – crossed off. When a second body is found – a woman, stabbed in the abdomen after her work Christmas do – Stonem can’t help but notice a grim connection between the crime scenes and the items on the seemingly innocent list. 2. Red party dress. Could this be a murderer’s twisted code?

On Christmas Eve, DCI Mackenzie Jones is called to a shooting at a remote farmhouse. Ralph Mallender believes his father lies dead inside. When three more bodies are discovered, it's clear a festive family gathering has turned into a gruesome tragedy. At first it seems like an open and shut case: a murder suicide committed by Ralph's volatile brother Cameron. Then new evidence makes Mack suspect the man who reported the crime is in fact the perpetrator. But Mack isn't the only one with a stake in the case.

Despite the uncomfortably claustrophobic quarters and rapidly dropping temperature, Christa believes they'll be safe as they wait out the storm. She couldn't be more wrong. Deep in the night, their tour guide goes missing...only to be discovered the following morning, his severed head impaled on a tree outside the cabin. Terrified, and completely isolated by the storm, Christa finds herself trapped with eight total strangers. One of them kills for sport...and they're far from finished.

Harley Granger has a gift for seeing things that others miss. He wasn't much of a novelist, but his work as a true crime author and podcaster has earned him fame and wealth—and some serious criticism for his various unethical practices. Still, visiting Little Valley to be closer to his dying father has caused him to look into a case that many people think is closed—and some want reopened.