Three stock market investors in San Francisco find themselves the target of a mystery investor, who is driving them to bankruptcy. The mystery investor is also sending the men a threat in the form of a note containing a tiger's head and a number, with the number indicating the number of days they have to live. When the daughter of one of the investors discovers the plot, she decides to take the matter into her own hands to save the two men she loves, and finds herself involved with a sinister Rajah and his beautiful slave-girl.

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