In the summer of 1940, as German forces sweptacross Western Europe and the threat of invasion loomed over Great Britain, Winston Churchill's government undertook one of the most audacious and secretive operations of the Second World War. Code-named Operation Fish, this missionwould see Britain transport its entire gold reserves and billions of pounds worth of securities across the treacherous, U-boat-infested waters of the North Atlantic to safety in Canada. It remains the most significant known movement ofphysical wealth in history, and remarkably, not a single gold bar was lost.