Operator #5: The Masked Invasion: First in the Classic Pulp Series! (Volume 1)

Invisible, secret, deadly, the masked empire wielded its dread power of darkness throughout the nation. Havoc and ruin followed the terror-torn thousands who fled the country to escape the Thirteenth Darkness. America, faced with certain disaster, placed her chance of survival in one man’s capable hands—and prayed that the warrior gods might smile once more upon the miracle man of her Secret Service—Jimmy Christopher!