This book provides an in-depth account of the early stages of Project Blue Book, the official U.S. Air Force project initiated to investigate UFO reports beginning in 1952. The book is written by Edward J. Ruppelt, the first head of Project Blue Book, and provides a firsthand account of the investigations, interviews, press conferences, and Pentagon briefings that took place during this time. The book also includes accounts from civilian and military pilots, air traffic controllers, office workers, farmers, and others who reported their encounters with UFOs.