Thundering far beneath Manhattan's thronging streets came the Death Express-a crack New York Central train bearing a gruesome cargo of lifeless men, women and children-their bodies stripped of valuables, naked and mutilated! A grim warning of the terror-reign that threatened America-at the hands of Twentieth Century land-pirates, whose weapon was neither gun nor sword, but the stunning, body-shivering force which lies in electricity! Can the Spider, using mortal weapons, fight the numbing power of the thunderbolt-and survive?