On a foggy night in Wales, a stranger walks into a house to find a murdered man and his wife standing over him with a gun. After observing her dazed condition and listening to an unconvincing confession, the unexpected guest offers to help. She accepts, and a story is concocted that blames the death on an unknown intruder. As the police investigate, clues point to a man who disappeared two years ago and a pandora’s box of love, suspicion and intrigue is opened to the damp night air.