A thriller as well as a puzzler set in a foggy estate in Wales, this mystery opens as a stranger walks into a house to find a man murdered and his wife standing over him with a gun. But the woman is dazed and her confession is unconvincing. The unexpected guest decides to help her and blame the murder on an intruder. Later, the police discover clues that point to a man who died two years previously and a Pandora's box of love and hate, suspicion and intrigue is opened in the night air.