During a gold-finding expedition to South America, and American and an Irishman stumble upon the entrance to the lost Aztec city of Tiapallan. There they find not only the remains of an ancient Aztec race, but a black stone containing an unspeakable evil. Before long this ancient evil brings horror to the shores of America in a way that only H. P. Lovecraft could have imagined. "The Citadel of Fear" is a brilliant combination of science fiction, fantasy, and supernatural horror.
