Mysteries for Halloween gathers an unusually capacious genealogy of the uncanny, ranging from classical marvel and Gothic romance to detective puzzle, psychological terror, spiritualist speculation, and supernatural satire. Its selections move among compact shock tales, antiquarian hauntings, sensational narratives, and eerie investigations, revealing how Halloween's atmosphere of threshold and concealment has energized multiple literary forms. Apparitions, doubles, cursed objects, inexplicable crimes, and unstable testimony give the volume both narrative suspense and historical depth. The contributors constitute a transnational and transhistorical company: canonical practitioners of the Gothic, Victorian sensation fiction, early crime writing, Decadence, realism, and the weird tale appear alongside writers associated with psychical research and occult thought. From Pliny the Younger's foundational ghostly anecdote through nineteenth- and early twentieth-century experiments in detection and spectral fiction, the collection traces changing cultural responses to death, rationality, scientific inquiry, and belief. These diverse voices illuminate the overlap between modern mystery and older traditions of the marvelous. Ideal for students, Halloween readers, and enthusiasts of Gothic and detective literature, this volume offers a rich comparative encounter within a single book. Readers are invited to follow the productive dialogue between skepticism and superstition, terror and wit, investigation and revelation, while appreciating the breadth of forms that have shaped the literature of mystery.