Mona and Mary accidentally learn of the fate of one of the victims of the Laidlaws, who are loan sharks. As justice can be secured in no other way, they determine to lay a trap for the two. Mona, by a clever ruse, makes the acquaintance of the son, and as the days go by the worthless young man finds himself in love. Then Mary enters the game by going to the elder Laidlaw, with a tale that her sister, Mary, is a mercenary adventuress, only playing with the son’s affections. The father visits Mona, who has been warned of his coming, and is prepared to act the adventuress role. She spurns his attempt to buy her off. Meanwhile, Laidlaw, Senior, has succumbed to the guileless charm of Mary, and the son is worried that his money will go to her. Mona advises him to purchase her affections. Though the girls find the maintenance of dual personalities a trying task they work events to the point where father and son each come across with cash to buy the other’s mate off. There is a sad awakening when the girls disappear after relieving the distress of the loan shark’s victim.