PERHAPS A GIFT VOUCHER FOR MUM?: MOTHER'S DAY
The author is the great-great-grandson of a former owner of Bletchley Park, when it was simply a country house, before it was bought by the secret service and became the centre where the Germans' supposedly unbreakable Enigma cipher machine was often broken and read. Most books on the subject so far have covered the enormous strategic, and occasional tactical, roles of ultra secret decrypts, but Sebag-Montefiore concentrates on the naval aspects of the story, attempting the difficult task of explaining to a lay readership exactly how the process of decipherment worked. The trickiest mathematical passages come in appendices; the main text is enlivened with numerous tales of naval gallantry, as U-boats were captured and boarded at sea, and of horror, as merchant ships were sunk without warning. An exceedingly complicated subject provides the background for a stirring book. (Kirkus UK)
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