The Knave of Spades(1960)

The Knave of Spades is a crime thriller that follows a solitary lighthouse keeper who agrees to an unusual arrangement: temporarily trading places with a police inspector to help capture Teston, a notorious criminal mastermind. Isolated in his seaside tower, the keeper has lived far from the law's complications, but the inspector's desperate request pulls him into a dangerous game. As the two men exchange their worlds, the keeper must navigate the criminal underworld while the inspector takes refuge in the lighthouse. The hunt for Teston becomes increasingly complex, blurring the lines between hunter and hunted. With tension mounting and trust uncertain, both men discover that swapping identities means swapping risks—and that some criminals are far more cunning than anyone anticipated.