‘Blinker’ Hall, Spymaster, by David Ramsay
The first world war admiral, ‘Blinker’ Hall — so-called for the obvious reason — is less widely known than Jellicoe, Beatty & Co., but his contribution to victory and history was arguably greater. He was the Director of Naval Intelligence (DNI) who ensured the success of Room 40, the 1914 equivalent of Bletchley Park in 1939.

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