Was the last prisoner of Spandau Prison in Berlin really Rudolf Hess, one time deputy to Adolf Hitler, or a doppelganger put in his place by the Nazis before his incredible flight to Britain in 1941? Claims have been made in recent years that the body of the man who died in Spandau Prison in 1987 at the age of 93 bore none of the chest wounds suffered by the real Hess in the First World War. Christopher Andrew talks to wartime witnesses and forensic experts in a personal investigation to establish whether the strange case of Rudolf Hess is a genuine example of the conspiracy theory of history.