The unscrupulous attempts by speculators Dr. West and Jim Prince to have a railroad pass through lower California are met with opposition by Spanish landowners led by Dona Maria Saltonstall, who tries flirting with West to restore their property. Pereo, a religious fanatic who works for Dona Maria, believes in the curse of the Gray Wolf's Ghost: if a member of Dona Maria's family mates with an alien, fortune and life will be lost. Meanwhile, West's son Harry, whom he deserted years before, comes to avenge the wrong done to his mother.

Carmen, a maid, steals a locket belonging to the Aragon princess Maria Theresa and sells it to Gaines, a New York art collector, not knowing that the locket contains the clue to the Aragon family fortune's whereabouts. Based on the 1909 Broadway play of the same name by Paul Dickey and Charles W. Goddard.

A young woman who owns a coffee shop falls for a handsome young customer, unaware that he is a gangster.

Parker, an Army lieutenant at a Western outpost, falls in love with Barbara Taylor, daughter of his commanding officer. But when Barbara rejects him, Parker fights with another soldier and deserts. An Indian attack gives him a chance to redeem himself.