Conan and Red Sonja are being chased by bounty hunters after leaving the city of Arenjun with a suspicion of murder charge hanging over their heads. An arrow topples Sonja's mount, and Conan scoops her up as they make their way into a rocky, mountainous pass. They are forced to abandon their other horse as they reach a cavern in the cliffs, and Conan takes advantage of a loose boulder to topple on the pursuing bounty hunter, killing all but their leader, Mamnon, who flees to get more help. The two wander into the gigantic, red-misted cavern, and are attacked by a humanoind bat creature. They find a structure at the center of the fog, but are mystically attacked and rendered unconscious. Conan awakes first, to face Uathacht and her brother Morophla, immortal vampires cursed by Thoth-Amon, w