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James Kirland (Harold A. Miller) lives on a large estate with his five children. The oldest son, William, drinks too much and has a penchant for trouble. His sister Diana (Ora Carew) tries to keep an eye on him and one day discovers him keeping company with the Marquise D'Irancy (Bonnie Hill). During a party held at a neighboring mansion, the Marquise finds her valuable diamond missing. Although the theft is hushed up, the guilt seems to fall on William. Diana is the only one who believes he is innocent and she begins to investigate the situation. Helping her out is Clamp (Frank Mayo), a traveling peddler. Of course it turns out that Clamp is not really a peddler at all, and he rounds up the real crooks while winning Diana's heart.