On 19 February 1937 a Stinson monoplane with seven men on board vanished somewhere between Brisbane and Sydney. Its fate became a national obsession. Air force and private planes combed a large area for any sign of survivors or wreckage. None was found, and finally the search was called off. Then a young bushman, Bernard O'Reilly, decided to follow his own hunch about where the plane might be. On 27 February he set off on the bushwalk of his life.