He Could Stop the World (Doc Savage, #54)

The world was imperiled by a terrifying, malevolent force that had the power to change men's minds. Even Doc Savage's own men willingly deserted him when struck by the waves of the Mind Changing Monster. High in the Sierras, he lived in an incredible fortress-- ruthless, omnipotent, preparing to rule the world. But he hadn't reckoned on the superhuman powers of the Man of Bronze.