In 1882 a country girl disappears from a small Hungarian village. The inhabitants suggest that she was murdered by the Jews. Everything is done to accuse them before the trial. A study in stubbornness, racism and intolerance and how to fight against it.

In postwar Vienna, Austria, Holly Martins, a writer of pulp Westerns, arrives penniless as a guest of his childhood chum Harry Lime, only to learn he has died. Martins develops a conspiracy theory after learning of a "third man" present at the time of Harry's death, running into interference from British officer Major Calloway, and falling head-over-heels for Harry's grief-stricken lover, Anna.