The actions of a greedy fisherman awaken an ancient demon, Khosatral Khel, on the remote island of Xapur. Khel resurrects his fortress which once dominated the island, including its cyclopean walls, gigantic pythons, and undead citizens.Meanwhile, an evil governor from Turan, Jehungir Agha, tricks Conan into pursuing Princess Octavia to the island of Xapur. Jehungir Agha plans for Conan to fall into a prepared trap on the island. The unforeseen resurrection of Khel and his ancient fortress interrupts Agha's original plan.