Never told in detail before, this is the account of how, for four years, British and Allied codebreakers decrypted secret SS and Gestapo messages detailing the mass killings of the Holocaust, and how the Germans in turn deployed cryptanalysis to try to conceal their persecution of Europe''s Jews. The compelling and fast-paced narrative is told from the perspectives of two central and opposing characters, who never meet.At Bletchley Park, there is the legendary but unsung British codebreaker Nigel de Grey, shy, determined, nicknamed ''the Dormouse'' by his colleagues. In Nazi-occupied Poland, SS Major Hermann H-fle, a former taxi driver from Salzburg, and one of the Third Reich''s ruthless bureaucrats of mass death, oversees the operations of five concentration camps, including Treblinka.De Grey fought hard to make sure the vital intelligence from decrypted signals reached Allied leaders and was acted on. H-fle, meanwhile, used complex coded messages to try to conceal the mass killings.
