Bill O'Brien is promoted to lieutenant in the police department for his arrest of Mike Patello, gang leader and racketeer, for murder. Ruth Dale, who loves Bill, is concerned when her brother, Johnny, who witnessed the murder, proposes to testify against the racketeer. Meanwhile, Captain Antrim informs Bill that his father has just been released from prison and does not know his son is a policeman. On the way from prison, O'Brien (J. P.) meets Limo, a former cockney pal who recognizes Bill and k...