In this volume, we discuss various ghost experiences, and present the arguments for and against the validity of such cases. We examine firsthand accounts, often backed up by independent witnesses, and present the facts with an open mind. We look at the methods that investigators employ in ghost detection, and discuss the numerous hypotheses put forward by the experts in the field. However, despite numerous theories, accounts, investigations, and first-person reports, the quest for the truth continues. The question: "Do Ghosts exist?" is one that may never be answered. - The Editors