Calmet draws on a wide range of sources to provide a detailed examination of the supernatural, including historical accounts, personal experiences, and theological treatises. He explores the nature and origins of supernatural phenomena and discusses their possible explanations from both religious and scientific perspectives."The Phantom World" is divided into three parts. The first part examines the nature and existence of ghosts and spirits, and includes discussions on the appearances of saints, miracles, and the resurrection of the dead. The second part explores the existence of demons and their ability to interact with the physical world. The third and final part of the book focuses on supernatural phenomena related to animals, including stories of werewolves and vampires.Calmet was known for his skeptical approach to supernatural claims, and "The Phantom World" reflects this critical perspective. While he acknowledges the existence of supernatural phenomena, he is careful to examine them from a rational and logical perspective, and he often provides alternative explanations for the reported events."The Phantom World" remains an important work in the history of supernatural studies and reflects a growing interest in the supernatural during the 18th century. The book provides a fascinating insight into the beliefs and experiences of people during this time and offers a unique perspective on the nature of the supernatural.