The movie takes place in 1939 London during World War II. It's based on a novel by Hilary Mantel. Harry Lime (Robert Taylor) is an idealistic detective working with Scotland Yard. He's smart and efficient. He's assigned to solve a string of unsolved murders. Harry believes he knows who committed them, but he's wrong. Harry believes it's someone he's helped before. That's why he's suspected by Scotland Yard. He's convinced he's innocent, but there's something rotten about him. He's attracted to Sheila Crocker (Glynis Johns), an inspector assigned to help him. Sheila believes she's innocent too. She's attracted