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In this drama, "The Rat" is the moniker for a notorious jewel thief whose life suddenly changes when a friend facing life imprisonment asks him to take care of his daughter. She does a good job of helping in the thief's home, but then a woman falls for him and throws her own boy friend out. The jilted lover decides to get revenge, goes to the Rat's home, and attempts to kidnap the young girl, who fights back so hard she kills him. The kindly thief then takes the rap for the murder, but at the last moment in court, the other woman appears and provides him with a real alibi causing the girl to go to prison. Fortunately, in lieu of the circumstances, she is given a light sentence.