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Tim McGuire, although renowned as "The Brute" in the San Francisco underworld, has an adopted family including Abie (his boyhood friend), a former professor, and the latter's 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 saves the camp from a dynamite explosion and wins the girl.