TWO DOC SAVAGE ADVENTURES IN ONE VOLUME!Prospecting in the Wyoming badlands, Patricia Savage spies a man swimming in circles––high in a cloudless sky! After he falls to his death, the dead swimmer is discovered soaked to the skin. Who is he? How did he manage to swim through thin air?These are the questions Pat sets out to answer when her cousin, the famous scientist-adventurer Doc Savage, diagnoses her account as a hallucination caused by altitude sickness. But when the bronze-skinned girl vanishes, the Man of Bronze is forced to take action.From the Bighorn Mountains to Devil’s Tower, Doc Savage and his mighty crew race against time to avert an impending tragedy created by a nebulous devil in human form who calls himself Mr. Calamity.BONUS NOVEL: A letter from Doc’s long-dead father presents him with a life-changing challenge that brings him to The Valley of Eternity….and the Man of Bronze does the unthinkable: he ditches his loyal aides in favor of his cousin, Patricia––the only one who can help him succeed in the most perilous quest of his entire career.