The Cambridge Key: A Story of Tolkien and Lewis

In 1937, 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 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…