The book "Air Force Boys Behind Enemy Lines; or, The Secret of a German Spy" is an exciting adventure novel by the famous American writer Charles Emory Beach. In this exciting story, the heroes - young pilots of the aviation service - find themselves in danger during the First World War. After engaging in fiery dogfights with German airmen, the boys face betrayal within their own ranks when a touted German spy infiltrates their ranks. Will they be able to uncover the spy's secret and save their country from danger? It isn't until they fly over enemy territory that the boys realize that their enemies may be closer than they expect. Air Force Ones Behind Enemy Lines is a gripping story of friendship, courage and loyalty that will captivate readers of all ages.