The Annihilist (Doc Savage, #31)

The dread Annihilist was slaughtering the criminals of New York in wholesale lots. Hundreds of men were found mysteriously murdered, victims of the hideous pop-eyed death. The finger of suspicion pointed directly at one man, Doc Savage himself. Even as The Man of Bronze scrambled to solve the terrifying enigma, the invisible assassin began to play havoc with one of humanity’s most important secret defenses — Doc Savage’s legendary crime college.