At Monkswell Manor, amidst a raging blizzard, newlyweds Mollie and Giles Ralston welcome a diverse group of guests, each with their own secrets and quirks. News of a recent murder casts a shadow as a Police Sergeant Trotter arrives, revealing a disturbing local connection between the victim and the death of a young boy many years ago.

Tension builds as a guest is found murdered, and the remaining inmates become increasingly suspicious of each other. Trapped by the blizzard, with the phone lines down and the killer among them, the remaining guests must uncover the culprit before more lives are claimed.