Holly Martins - A pulp Western writer who travels to post-WWII Vienna to take a job with his old friend Harry Lime, only to find Lime has been killed in an accident.

Harry Lime - An opportunistic racketeer who makes a dramatic entrance partway through the film. His famous "cuckoo clock" speech rationalizing his profiteering during the war is one of the most memorable moments.

Major Calloway - A British military police officer investigating Harry Lime's criminal activities and death.

Anna Schmidt - Harry's lover who initially assists Martins but later betrays him to protect Lime.

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