Bob Norton is in love with Peggy O'Brien, who conducts a profitable modiste's shop under the name of "Mme. Frou Frou." Peggy will not marry Bob unless he has sufficient money, so he calls on his father at his office in Wall Street and finds him dilating over the excellent qualities of a bulldog, for which he has just paid $500. Bob's request is denied and when he tells his father that he is in love with a handsome milliner, it only adds to the old man's anger. However, old Morton tells his son that if he can prove himself worth as much as the dog, he shall have the amount he paid for him. Then he orders Bob to lead the dog home and to take good care of him. Bob goes to the establishment of his lady love. The bull spies a cat, the mascot of Peggy's shop, and in the chase which follows, the shop is almost wrecked. Peggy succeeds in imprisoning the bull in a closet. Bob soon afterward shares a similar incarceration to which he makes an emphatic protest. An hour later Norton receives a telephone message from his son's lady love. He is ordered to call at Peggy's shop and pay a ransom for his dog. Norton yields and after paying the cost price for the dog's release, is staggered when he finds that he must also pay a ransom for his son, who all this time has been languishing in the closet. Norton tells Peggy that all he cares for is the dog. Peggy asserts that she does not want his son either. Bob is turned over to his father, who leads out his son and his dog. At this point Peggy's heart manifests itself. Finding she is going to lose Bob, she barters with Norton for his son and offers the check she has just received for the wreck of her shop. The millionaire's heart is touched. His son has proved to be worth $500 after all and while worthless to everyone else he is worth that much to Peggy. Moreover, she possesses the common sense which a boy of Bob's type needs in a life partner, and besides she is a very lovely young woman. Norton tears up Peggy's check and writes another, one that is a very substantial foundation of their matrimonial structure.