Codes. Ciphers. Mysteries. This week’s guests are fascinated by codebreaking and cryptography: as well they should be! The Voynich Manuscript, the Dorabella Letter, The Beale Papers, the Zodiac Cipher, Kryptos – so much history, intrigue, and speculation. Andrew sat down with Elonka Dunin, code-breaker extraordinaire, and Klaus Schmeh, a world leading expert on the history of cryptography, to discuss the cat-and-mouse game between code-makers and code-breakers across the ages from ancient cuneiform up to quantum cryptography. Word to the wise: their book has been described by Sir Dermot Turing as “the best book on codebreaking I have ever read, a must for would be recruits to GCHQ and the NSA.”