Anton Karas asked a stunned Karas if he would compose the music for the film. Karas protested, saying he had never actually written music. As Karas later told the story, the director insisted and invited Karas to England. The Austrian became homesick and asked to be allowed to return. Reed told him he could—as soon as he had written the music. Under this pressure Karas wrote his Harry Lime theme. The film—with the music a contributing factor—was a gigantic success, and Karas' life was changed drastically. As a result, he toured all over the world and performed for many celebrities, among them
Archie Karas poker. Karas stated, "with each play I was making million-dollar decisions, I would have played even higher if they'd let me." Transporting money became a hassle for Karas, as he had several million dollars in his car every day. He carried a gun with him at all times and would often have his brother and casino security guards escort him. At one point, Karas had won all of the Binion's casino's $5000 chips, the highest denomination at the time. By the end of his winning streak, he had won over $40 million. Karas's odds-defying two-and-a-half-year streak came to an end