William H. Power

Behind every great genius was a great rival - an unstoppable adversary whose incredible vision, determination, and ambition is their match. Out of their struggles came the world's most brilliant inventions, the spoils of the heated battle between competitors.

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Retired gem merchant Peter J. Martin hires detective Dan McRae to guard a large diamond which he plans to present to his daughter Ruth on her twenty-first birthday. Notorious jewel thief Gentleman Joe overpowers McRae, however, and takes his place at Ruth's party.