Doc Savage: Death's Dark Domain (The Wild Adventures of Doc Savage Book 4)

In the aftermath of the evil John Sunlight’s pillaging of the secret Fortress of Solitude, a dreadful super-weapon has fallen the hands of a Balkan dictator intent upon seizing control of the vampire-haunted zone of desolation known as Ultra-Stygia. War is imminent. Monsters are loose in the disputed region. A strange darkness falls over the sinister landscape. Only Doc Savage, the Man of Bronze, understands the terrible threat to humanity. And only he can prevent the terror from spreading…