Old 666 was a Boeing B-17E Flying Fortress heavy bomber, serial number 41-2666, assigned to the United States Army Air Forces (USAAF) 19th and 43rd Bombardment Groups in 1942–1943. This aircraft was piloted by Jay Zeamer and his hand-picked crew. This crew flew several mapping missions, including a very scary one that this book covers. This was such an ordeal for this crew. If you are into aviation history or war history, this book would be of great interest to you. If you are further interested in this crew, there is a display for Zeamer and his "Eager Beavers" at the National Museum of the United States Air Force.