Carlotta and her old father, struggling for an existence, are befriended by Marino, a hardened character of the underworld. Marino, under the guise of friendship, misleads Carlotta, who puts up a brave fight. She is rescued by Peter, an old friend who happens to come on the scene. In the meantime Carlotta's father, learning of Marino's perfidy, swears vengeance. He soon finds Marino and a fight follows. Marino is about to stab Carlotta's father when he is subdued by Peter. Peter and Carlotta are now happily married and lay plans for a happy future.