Leif Langdon finds himself transported from the modern world into the ancient, perilous realm of the Mirage, where he must contend with a dual existence. Langdon discovers that his arrival has awakened Dwayanu, a powerful entity sharing his own physical form. He must navigate the complex political and supernatural landscape of the Mirage while caught between the influence of the witch-woman Lur and the ethereal Evalie. The narrative utilizes a third-person perspective to explore the psychological tension of two consciousnesses inhabiting a single body within a hostile, exotic environment.

Readers often characterize this work as a quintessential example of early twentieth-century pulp fantasy. Discussion frequently centers on the imaginative world-building and the surreal, dreamlike quality of the Mirage setting. Critics note the author's focus on high-concept adventure over grounded realism, which defines the pacing of the narrative. Many readers highlight the psychological conflict of the protagonist as a standout feature that distinguishes the book from standard adventure tales of the era. The prose is frequently described as lush and evocative, contributing to the overall sense of wonder that persists throughout the story.