A young man, broken down in the fog, witnesses a murder he is asked to conceal... A full-length novel adapted by Charles Osborne from Agatha Christie's acclaimed play. The confession was just the beginning. Lost in the fog, a stranger seeks refuge in a nearby house. But when he enters he finds a woman with a smoking gun, standing over the body of her dead husband. She admits to the murder, but her confession is anything but convincing. Is it possible that she did not commit the murder after all? And if so, who is she shielding? The house is full of suspects, and a tangled web of lies reveals family secrets and chilling motives.