They called Secret Agent "X", the Man of the Thousand Faces. Armed with his irresistible gas gun, wearing impenetrable disguises, "X" infiltrates the darkest corners of the Underworld to crush all crime czars! Silent, horrible as the crushing coils of a serpent were those unseen fingers that blotted out men's lives. A criminal of satanic proportions had risen-the "Black Master," whose victims fell with livid, hideous faces and protruding tongues that seemed a ghastly mockery of the fate they had suffered. Along this terrible murder trail Secret Agent "X" gambled with the Dice of Death.