On 16 September 1944, an Allied fighter pilot was shot down near Arnhem, the day before Operation Market Garden. He was captured, beaten and then murdered. War Crimes investigators brought four Germans to trial. One was executed but others involved were never caught. The man who was executed had fired the fatal shot 'under orders', but the man who gave the order has not been found - yet. This is the compelling story of ordinary family men who became cold-blooded killers, and of Tempest pilot Bill Maloney who was in the wrong place at the wrong time and lost his life to them.