The Spectral Strangler: From the Records of Secret Agent "X"

The Spectral Strangler (1934) – 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.

Secret Agent "X" is a master of disguise and his true identity is never revealed...