Reckless heir of an influential San Francisco family, Perry Danton must prove his worth by taking a job with the family lawyer before he is entrusted with the Danton fortune. When Perry's fiancée Camilla mistakes criminal Slim Attucks for Perry, Attucks realizes that he can take advantage of the resemblance and concocts an elaborate plan, installing his cohorts in positions close to the Dantons. He then has Perry shanghaied onto a steamer bound for Honolulu. Taking over Perry's job and fiancée, Attucks soon becomes so familiar with Perry's affairs that Perry can make no one believe his story when he returns. After enlisting the aid of the editor of a major newspaper, Perry confronts his double in the lawyer's office, where a test is administered that supports Attucks' claim, thanks to Perry's feeble knowledge of his own affairs.