Relentless, unhindered, that eerie, green mist advanced slowly up the Lower Bay like a formless nightmare monster. Deep-bellied vessels which sailed nearby were engulfed in its nebulous depths, and emerged in flames! A wide, devastated path marked its progress across New York City... Etoria, powerful and greedy, the snarling war-dog of the Mediterranean, was striking to cripple America's defenses, preparing ruthlessly to establish the most magnificent empire in history... Operator 5, Ace of the Intelligence, known in private life as Jimmy Christopher, makes the gravest decision of his life. Hampered by cowardly, official red-tape, he resigns from the Service. Marked as the enemy's first victim, he carries the battle, single-handed, across the ocean and into the Etorian dictator's own guarded stronghold!