The story of the World War 2 de-coders of Bletchley Park continues to fascinate many.

How did Mair Thomas, brought up in the Welsh valleys and a musician, find herself in the rarefied atmosphere of Hut Six, surrounded by hundreds of others, all desperately trying to break the German Enigma Code? How did she cope? What was it like?

Sworn to secrecy and working in cramped and uncomfortable conditions, Mair discovered her degree in German and Music was just what was needed. But her background was very different to that of most of her colleagues, drawn from the public schools and Oxbridge. How did she manage, and what relationships did she build?

This book gives a fascinating insight into one woman's battle and vividly captures an era of danger, strain - and day to day difficulties, brightened occasionally by visits from the top brass, including Churchill.