Among the military leaders of World War Two, Grand Admiral Karl Doenitz remains a deeply controversial figure. As chief of the German submarine fleet he earned Allied respect as a formidable enemy. But after he succeeded Hitler - to whom he was unquestioningly loyal - as head of the Third Reich, his name became associated with all that was most hated in the Nazi regime.

Yet Doenitz deserves credit for ending the war quickly while trying to save his compatriots in the east. His Dunkirk-style operation across the Baltic rescued up to 2 million troops and civilian refugees.

He was sentenced to ten years at Nuremberg - a penalty acknowledged as a blatant example of victor’s justice - and after his release from Spandau kept well away from politics.

Barry Turner’s closely-examined and even-handed portrait gives a fascinating new perspective on this complex figure, to whom history has not been kind.