Not until the Man in the Red Mask had seized the nation's entire supply of life-saving drugs and enslaved the medical profession, did the police realize the purpose of Murder's newest henchman! By then, the department was paralyzed; young Dr. Guilmuir was sacrificing his life in the chair; his fiancee and Nita van Sloan were in the Vipers' Pit—and the Spider alone was left to answer Humanity's urgent cry for help!