With this book, you get exclusive snapshots into the organisation that keeps us all safe. Train your brain to compete with the smartest in the country with this stimulating book of puzzles.

In this book you will find: - Tips on how to get into the mindset of a codebreaker - Puzzles ranging in difficulty from easy to brain-bending - A competition section where we search for Britain's smartest puzzler With hundreds of ...

In this book you will find: - Tips on how to get into the mind-set of a codebreaker - Puzzles ranging in difficulty from easy to brain-bending - A competition section where we search for Britain's smartest puzzler - Challenges that have ...

At GCHQ, we solve puzzles every day . . . and we're giving you a rare glimpse into our world, by setting you a top secret mission: solve problems and break codes that could befuddle the cleverest codebreaker.