 David Wilton, John Aynesworth, and Smith are among a group of cadets hoping to become pilots in the Royal Air Force. David, however, has poor height perception and cannot master his landings. Therefore he is sent to navigator s school, but finds it hard to concentrate on his new job due to despondency over losing his chance to be "something important," a pilot. His friends and teachers join in an effort to show David the vast importance of the navigator, something he learns for himself over the target city of Berlin.