Sadly, the author has died, but this is a most welcome third edition and a tribute to his efforts as a writer. Scapa Flow played a vital role in the British naval conduct of the two greatest world wars. Prior to WWI, the Royal Navy had been deployed along the English coast from Devonport to Chatham to face a French threat. The German threat during the Twentieth Century required a new set of battle plans and saw the North Sea become the focus of attention. Scapa Flow provided a large sheltered anchorage from which the Royal Navy could counter the major surface vessels of first the German High Seas Fleet and then the Kriegsmarine of Hitler’s Germany.