The plot concerns the resurrection of a mythical demon due to the theft of a sacred dagger, and an unrelated trap that lures Conan to the island fortress roamed by the demon. Due to its plot loopholes and borrowed elements from "Iron Shadows in the Moon," some Howard scholars claim this story is the weakest of the early Conan tales. In "The Devil in Iron," an ancient demon, Khosatral Khel, is awakened on the remote island of Xapur due to the meddling of a greedy fisherman. Upon reawakening, Khel resurrects the ancient fortress which once dominated the island, including its cyclopean walls, gigantic pythons, and long-dead citizens.