A mysterious disappearance in the South Seas triggers a high-stakes search for a missing woman and the truth behind her alleged supernatural influence. Protagonist Gregory Sallust navigates the treacherous waters of the Pacific, driven by the need to uncover the fate of a woman known as the White Witch. He faces opposition from local power brokers, colonial tensions, and the physical hazards of an isolated island environment. The narrative utilizes a third-person perspective to track the investigation, emphasizing the logical deduction required to peel back layers of superstition and deception. The story operates within the framework of a classic adventure thriller, where environmental isolation serves as a primary constraint on the protagonist's movements and resources.

Readers frequently highlight the atmospheric quality of the South Seas setting, noting how the author constructs a sense of isolation that heightens the narrative tension. Discussion often centers on the protagonist's methodical approach to solving the central mystery, which contrasts sharply with the more sensationalist elements of the plot. Critics observe that the pacing is deliberate, favoring slow-burn suspense over rapid-fire action sequences. The work is often cited for its period-specific perspective, which provides a window into the adventure writing conventions of the mid-twentieth century. Readers generally appreciate the balance between the grounded investigative elements and the more exotic, mysterious components of the story.