The collection centers on the intersection of Victorian rationalism and the encroaching, inexplicable forces of the supernatural. Arthur Conan Doyle utilizes his medical background and interest in spiritualism to craft narratives where protagonists often encounter phenomena that defy scientific explanation. These stories frequently pit men of logic against malevolent entities or environments, ranging from desolate polar landscapes to sinister medical practices. The narrative framework varies across the collection, employing both first-person accounts and third-person omniscient perspectives to heighten the sense of dread and uncertainty.

Readers and critics frequently highlight the contrast between Doyle's clinical, precise prose and the irrational, terrifying subject matter of these stories. Discussion often centers on how the author's own life as a physician and spiritualist informs the specific brand of horror found within these pages. Many note that the collection effectively captures the anxieties of the late nineteenth century, particularly regarding the limits of human knowledge. The pacing is generally described as deliberate, allowing the atmosphere to permeate the narrative before the climax occurs. This collection is often cited as a significant look at the evolution of the Gothic genre through the lens of a master storyteller.