Joseph Michael. The GCHQ Puzzle Book

Amazon Digital Services LLC, 2016. — 367 p. — ASIN: B01MCTE3RY. — ISBN: 0718185544.If 3=T, 4=S, 5=P, 6=H, 7=H... what is 8?
What is the next letter in the sequence: M, V, E, M, J, S, U,?
Which of the following words is the odd one out: CHAT, COMMENT, ELF, MANGER, PAIN, POUR?
GCHQ is a top-secret intelligence and security agency which recruits some of the very brightest minds. Over the years, their codebreakers have helped keep our country safe, from the Bletchley Park breakthroughs of WWII to the modern-day threat of cyberattack. So it comes as no surprise that, even in their time off, the staff at GCHQ love a good puzzle. Whether they're recruiting new staff or challenging each other to the toughest Christmas quizzes and treasure hunts imaginable, puzzles are at the heart of what GCHQ does. Now they're opening up their archives of decades' worth of codes, puzzles and challenges for everyone to try.
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.Preface by HRH The Duchess of Cambridge
Foreword by Director GCHQ
Solving Puzzles for Fun at GCHQ
Introduction to the Puzzles
Section Starter Puzzles
Section The Puzzles
First Colour Section
Second Colour Section
Third Colour Section
Kristmas Kwiz Challenge
Hints
Explanation of Puzzle Types
Clues to the Starter Puzzles
Answers
Appendix.