"The movie that night was The Man Who Never Was"

The Man Who Never Was (1956) is based on a World War II novel by Ewen Montagu, which in turn was based on the real Operation Mincemeat. British Intelligence wanted the German High Command to shift its forces away from Italy prior to the 1943 Allied invasion of Sicily. So they faked a plan to invade Greece and planted misleading papers on a dead body washed up in Spain...