"The Philadelphia Experiment: Project Invisibility" by Charles Berlitz and William L. Moore is a vintage nonfiction book published in 1979 by Fawcett Crest. This illustrated paperback delves into the mysterious events of the Philadelphia Experiment in the 1940s, exploring the secrets of Project Invisibility and its implications for national security. Intended for adult audiences, the book is part of the After Dark series and provides a detailed account of this intriguing historical event in the 1970s era.