Based on an outline by his creator, the mystery begins when a visiting Balkan king vanishes, whisked away by the Whistling Wraith. Called to Washington, Doc Savage confronts the impossible — a mad monarch who vanished centuries ago. Unstoppable and untouchable, the demon stands ready to plunge his uncanny sword into the vitals of all who seek to unravel the most baffling enigma ever to confront the brilliant Man of Bronze!

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