Overview: An investigation into the disappearance of Glenn Miller during World War II. On December 15, 1944, the Army Air Force plane carrying him from England to France vanished while flying across the English Channel. The report makes use of a plane spotter's notebook that was discovered in 2012 to pinpoint the path of Miller's plane; and digs into several theories, including one that friendly fire downed the plane and another that he was on a secret mission to end the war.