Previously unseen notes of an army psychiatrist reveal how the British tried to get inside the mind of Germany's Deputy Fuhrer, Rudolf Hess, during World War II in an attempt to get inside the mind of the Nazis.
On a rainy summer afternoon, on 2 June 1941, Dr Henry Dicks arrived at the heavily fortified MI6 safe house in Surrey, having been called to examine Hess, who was a British prisoner.