Lost: Unsolved Mysteries of Canadian Aviation by Shirlee Smith Matheson is even more compelling than the original book Lost: True Stories of Canadian Aviation Tragedies published in 2005 and now out of print. New information has brought many of the stories up to date. In some cases there has been a degree of closure; while in others the mystery seems fated to forever remain unsolved. One of the themes that runs through Lost: Unsolved Mysteries of Canadian Aviation is the enigma of aircraft that disappear, sometimes within miles of busy airports and crowded cities, and cannot be found despite desperate and prolonged searches. Sometimes wreckage is discovered decades later; on other occasions the aircraft simply vanishes, seemingly forever.