Never had Richard Wentworth—he who is the scourge of the Underworld in his guise of the Spider—faced such tremendous odds or been so alone in the strife! Nita, his beloved, had tried to kill him, was hopelessly insane. His faithful servant had been tortured beyond human endurance. And the Master of Madness, chief of a powerful, fiendish syndicate, was spreading his germs of mania unchecked. Who could rescue America from screaming, murderous frenzy when the Spider, harried by Law and lawless, himself half-doubted his own skill and bravery?