From the Bible code to the Voynich manuscript, from subtly altered hieroglyphs carved into ancient Egyptian monuments to clues hidden in Renaissance paintings, we are surrounded by mysterious codes bearing hidden messages from the past. Can ingenuity and perseverance enable us to crack them? What does it take to write a fail-safe code? What does it take to break one? Taking in the full history of codemaking, from the scribes of ancient Egypt to modern day computer programmers, "Codebreaker" provides a fascinating insight into this most secret and mysterious of crafts. It shows just how Julius Caesar cunningly obscured the meaning of vital wartime messages and explains that Sir Francis Walsingham - the founder of England's first secret service - used coded letters to foil plots against Elizabeth I. It gives an account of the ever more complicated ciphers that were devised - and cracked - during the Cold War and investigates how codebreaking is being used today to fight crime and terrorism. And it shows you how to decipher codes from all periods of history, including many that are still employed today. If you want to pit your wits against famously unbroken codes like the Dorabella or the Beale Ciphers, discover more about the Navajo windtalkers of World War Two or simply get a taste of the long and distinguished history of the codemakers' craft, "Codebreaker" is a fascinating - and enlightening - guide.