This book is part of the "The UFO Files" series, based on my own, old favorite UFO books. It can be read individually or as part of the entire series. UFO is a fascinating subject that you can study in depth and constantly learn more about. The phrase UFO was coined as an acronym by Project Blue Book head Edward J. Ruppelt, but today UFO is widely used as a stand-in for extraterrestrial spacecraft-aircraft that people claim to have observed. Many UFOs are described as being flying saucers. This fascinating and interesting book is based on The Secret of the Saucers by Orfeo M. Angelucci. Enjoy reading!