by Nicholas Hallum 

In 1938, the British Crown anticipated war with the emerging fascist leader Adolf Hitler. The British Secret Service was desperate for code-breakers, and for a method to encode messages to Allied agents on the ground, deep in the heart of the continent.

One agent was assigned to solicit the help of a set of secretive, brilliant Cambridge professors to find a solution to this dangerous puzzle.

The cryptographic key these professors proposed was radical, and changed the course of the war effort (and English literature) forever…

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