1957, Ireland. Detective-Inspector Strafford is called in from Dublin to investigate a murder at Balliglas House—an isolated estate of the Osbornes, representatives of the local aristocracy. The case is complicated and likely to provoke scandal, because the victim was a parish priest. The weather turns; roads get buried under snowstorms. The head of the family tries to convince the police that an unknown burglar is to blame, though there are no signs of forced entry. Strafford—melancholic and perceptive, a descendant of a noble line—wants to find the killer at any cost, but everyone around him is hiding something and intends to keep their secrets. Gradually, the classic English detective story takes on increasingly chilling shades, and the inspector understands that he is facing real evil.