A perilous expedition into the uncharted interior of Africa leads two Englishmen to the discovery of a legendary, immortal queen who holds absolute power over a hidden civilization. Driven by a centuries-old family legacy, the protagonists navigate treacherous landscapes, hostile tribes, and physical exhaustion to locate the mysterious Ayesha. The narrative is presented through a frame story, utilizing a first-person perspective that documents the supernatural encounters and the psychological toll of the queen's influence. The world is defined by ancient ruins, occult phenomena, and the rigid social hierarchies of the Victorian era clashing with primitive isolation.

Discussion often centers on the complex and often contradictory portrayal of Ayesha as both a powerful female archetype and a manifestation of colonial anxieties. Readers frequently highlight the atmospheric world-building that defined the lost world genre for subsequent generations of writers. Critics often examine the text's reliance on Victorian tropes while acknowledging its influence on the development of speculative fiction. The pacing is noted for its transition from high-stakes physical survival to intense, dialogue-heavy sequences that explore the nature of eternal life. Many readers find the prose style reflective of its era, providing a window into the cultural preoccupations of the late 19th century.