The Citadel of Fear

Set against the backdrop of World War I, two Irish American prospectors embark on a perilous journey through the Mexican desert in search of fortune. Their adventure leads them to a dense jungle, rumored to harbor a lost Aztec tribe worshipping the serpent god Quetzalcoatl. When one brother is captured in the underground city of Tlapallam, the other vows to rescue him. This debut novel blends elements of lost world adventure and fantasy, showcasing Stevens' pioneering contributions to science fiction, and remains a captivating read for modern audiences.