Wealthy Bruce MacAllister, goaded by his fiancée, Helen, into proving that he is a man of action rather than a pampered youth tells his estate administrator, Eugene Preston, that he is going east for a meeting. Instead, Bruce dons a disguise and infiltrates the San Francisco underworld. Mistaken for master criminal "The Chicago Kid", he finds himself leading the gang in a robbery of his own fortune in diamonds. Discovering Eugene's intention to steal the jewels for himself he engineers it so the...