Berretín is a thief who lives next to the brook of Buenos Aires. One day he meets Remanso, a man who has just gotten out of jail and is determined to behave himself. Berretín falls in love with Rosa, a girl to whom he stole his wallet, and decides never to commit a crime again. Berretín and Remanso, meanwhile, move to the pension where Rosa lives with her mother, and will face El Carancho, an evil lover of the young woman who accuses the two friends of crime, sending them to jail.