Tim McGuire, renowned as "The Brute" in the San Francisco underworld, has an adopted family including his boyhood friend Abie and a former professor and his daughter. When he rescues a visitor, Lorraine Metcalf, from a gang of hoodlums, her father awards him a position as construction supervisor for a dam project in the Sierras. The company is opposed by a rival gang aided by a dishonest employee who kidnaps Lorraine during a gang fight. Tim save the camp from a dynamite explosion and wins the girl.—AFI