A group of travelers finds themselves trapped in a mysterious, weed-choked region of the ocean where ancient dangers persist. The protagonist and his companions navigate the treacherous Sargasso Sea, seeking to survive against both the natural hazards of the environment and the hostile inhabitants of a forgotten civilization. The narrative follows a traditional adventure structure, emphasizing the physical struggle against isolation and the logical challenges of escaping a realm governed by archaic, brutal customs. The story unfolds through a third-person perspective that highlights the mounting tension as the group realizes their predicament is far more complex than a simple shipwreck.

Readers often identify this work as a quintessential example of the lost world subgenre popular in early twentieth-century literature. Discussion frequently centers on the atmospheric world-building and the imaginative, albeit dated, depiction of isolated societies. Critics note that the pacing reflects the adventure conventions of the 1930s, prioritizing plot progression and environmental hazards over deep character interiority. Many readers highlight the influence of this narrative on subsequent cinematic adaptations, noting its role in shaping the visual language of maritime mystery stories.