This gripping read is based on an original report by Donald Keyhoe a former USA serviceman, charged by a magazine to investigate the reports of UFO activity. It documents the unexplained encounters between aircraft and military personnel in the mid and late forties. The book explores whether aliens have been visiting the Earth for centuries and if the military was actively investigating and covering up these visits. Newly edited, and with some new illustrations added, this is a must have book for the person interested in Unidentified Flying Objects.