Third Man

Holly Martins, an American author of Western pulp novels, arrives in the British sector of Allied-occupied Vienna seeking Harry Lime, a childhood friend who has offered him a job. However, Martins is told that Lime was killed by a car while crossing the street. At Lime's funeral, Martins meets two Royal Military Police officers: Sergeant Paine, a fan of Martins' novels, and Major Calloway. Afterward, Martins is asked to lecture at a book club a few days later. He then meets a friend of Lime's, "Baron" Kurtz, who tells Martins that he and another friend, Popescu, carried Lime to the side of the street after the accident, and that, before he died, Lime asked them to take care of Martins and Lime's girlfriend, actress Anna Schmidt.

As Martins and Anna query Lime's death, they realise that accounts differ as to whether Lime was able to speak before his death, and how many men carried away the body. The porter at Lime's apartment tells them that he saw a third man helping. He offers to give Martins more information but is murdered before they can speak again; Martins and Anna flee the scene after a mob begins to suspect him of the murder. When Martins confronts Major Calloway and demands that Lime's death be investigated, Calloway reveals that Lime was stealing penicillin from military hospitals, diluting it, and then selling it on the black market, injuring or killing countless people. Martins agrees to drop his investigation and leave.

An inebriated Martins visits Anna and confesses his feelings for her. A man crosses the street towards her front door, but moves away after seeing Martins at the window. After leaving, Martins walks the streets until he notices Anna's cat and realises someone is watching from a darkened doorway. In a momentary flash of light, Martins sees that the man is Lime. Martins calls out, but Lime flees and vanishes. Martins summons Calloway, who realises that Lime has escaped through the city's sewers to the Soviet sector. The British police exhume Lime's coffin and discover that the body is that of a hospital orderly who had been assisting him. Anna, who is Czech, is to be sent to the Soviet sector after the British police discover that she has a forged Austrian passport, and is questioned again by Calloway.

Martins goes to Kurtz and asks to see Lime. They meet and talk as they ride the Wiener Riesenrad. Lime speaks cynically of the insignificance of his victims' lives and the personal gains to be earned from the city's chaos and deprivation, further suggesting that he sold Anna out to the Soviet authorities in order to discourage them from pursuing him. He obliquely threatens Martins and taunts him for his infatuation with Anna before leaving quickly. Calloway asks Martins to help arrest Lime; he agrees provided that Calloway will arrange for Anna to leave Vienna rather than be handed over to the Soviets. The British authorities arrange for Anna to take a train to Paris, but she spots Martins, who has come to observe her departure, at the station. After persuading Martins to reveal the plan to capture Lime, she leaves in order to warn him. Exasperated, Martins decides to leave Vienna; on the way to the airport, Calloway stops at a hospital to show Martins children dying of meningitis who were treated with Lime's diluted penicillin, which convinces him to stay and assist in capturing Lime.

Lime arrives at a café in the international zone to meet Martins, but Anna is able to warn him that the police are closing in. He flees into the sewer, with the police following him underground. Lime shoots and kills Sgt. Paine, but Calloway shoots and badly wounds Lime. Lime drags himself up a cast-iron stairway to a street grating but cannot lift it. Martins, armed with Paine's gun, finds Lime beneath the grating and they exchange a look. Calloway shouts that Martins must take no chances and shoot on sight. Lime nods his head slightly at Martins, who then shoots and kills him.

Martins attends Lime's second funeral at the risk of missing his flight out of Vienna. He waits on the road to the cemetery to speak with Anna, but she walks past without glancing in his direction.