This encyclopedia investigates the global phenomenon of ghosts and spirits, exploring their historical and cultural manifestations. Rosemary Guiley, a noted author on paranormal subjects, compiles a comprehensive reference work drawing on folklore, mythology, and reported sightings from various cultures. The book aims to provide an organized and accessible overview of spectral entities, their alleged characteristics, and the beliefs surrounding them across different societies.

This work is recognized as a thorough and accessible compendium on the subject of ghosts and spirits. It is often cited for its broad scope, covering a wide array of global traditions and reported phenomena. The encyclopedia serves as a valuable resource for those interested in folklore, the supernatural, and the cultural history of belief in spectral entities.