On the evening of 4 July 1928, Alfred Loewenstein, one of the wealthiest men in the world, boarded his private aircraft at Croydon Airport. It was a routine flight—one he had taken countless times before—bound for his homeland of Belgium. The skies were clear, the aircraft, a Fokker FVII, was in good working order, and there was nothing to suggest that this would be anything but an uneventful journey. Yet, by the time the plane touched down, Loewenstein was gone. He had quite literally vanished