For his untiring work in keeping the members of the San Francisco police force in perfect condition, "Tiger" Jack O'Day, World's Champion Heavyweight, is made an honorary member of the force for twenty-four hours. The commissioner's daughter promises to let him lead the grand march of the policemen's ball, to be held that night, provided he sells one hundred tickets. While Jack is trying to sell the tickets, the editor of the city's most influential paper makes a wager with the commissioner that the first cop he sees will not be able to bring in the notorious thug, Spike McGann. The commissioner agrees to resign if the officer fails and the editor agrees to become his strongest backer if the cop succeeds. Jack happens to be the one selected and, although he manages to get Spike with little difficulty, he lets him get away in his eagerness to sell tickets to the ball. Later he learns that Spike is to fight that night and goes to the club and persuades the other boxer to let him take his place. Jack wins the fight and takes Spike to the commissioner at the ball just in time to lead the grand march and win the bet for the commissioner.