Codebreakers : the secret intelligence unit that changed the course of the First World War / James Wyllie and Michael McKinley.
London : Ebury Press, 
9780091957735 (pbk.) :
Originally published: 2015.
The stories of Bletchley Park and the spies of the Second World War are well known, but it was Room 40 and their colleagues across the intelligence services that started it all. From the docks of New York City to shady Cairo hotels, this is the gripping and fast-paced story of spies, codebreakers and saboteurs.
346 pages : illustrations (black and white) ; 20 cm
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