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.

This atmospheric thriller is one of the undisputed masterpieces of cinema, and boasts iconic performances from Joseph Cotten and Orson Welles.

'The Third Man' is acclaimed for its cinematography, especially its use of shadows and nighttime scenes. The zither soundtrack is noted, though opinions differ. Orson Welles' performance as Harry Lime is frequently praised for its complexity. The post-war Vienna setting, with its atmosphere of menace and intrigue, is a key theme. However, some criticize the plot for predictability and lack of depth, along with pacing and character development issues. The romantic subplot is often deemed unconvincing. Despite these criticisms, the film's mood, atmosphere, and supporting performances are widely appreciated.