In this crime melodrama, a Swiss woman finds herself unwittingly involved in a plot to steal from her employer, a London diamond merchant. Her boyfriend is behind the scheme. First he sends two accomplices disguised as German jewelers to see the boss. He is not fooled by their ruse and is killed while the woman is knocked unconscious. She awakens with amnesia and begins aimlessly wandering the London streets. Thinking that his girl has squealed to the police, her boy friend begins scouring the town to find her. Meanwhile, she is taken in by a boxer who returns to the ring to win the money needed to get her out of the country. Trouble ensues when her lover finally finds her after the match and begins beating on the exhausted fighter.