Berlin in the early 1930s. Bello is an unemployed young man who loves the underage Frieda. In order to earn a living for both of them, Frieda goes on the streets. An inspector from the political department takes advantage of this to blackmail Bello into providing informer services. But that's not all. A jealousy murder among pimps, whose victim is a high-ranking Nazi, is blamed on the Communists, and Bello is supposed to be the key witness. He refuses. When the Nazis come to power, they reopen the case to turn the murdered man into a martyr. Bello still refuses. He now believes he is safe because Frieda is now of age. But he pays for his refusal with his life.

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