‘Dear God, what is it like in your funny little brains? It must be so boring.’ Can you pit your wits against the best and the wisest? Through these 200 puzzles and challenges, you’ll be able to elevate your powers of deduction, detection and general brilliance. From codes and sequences to perceptual and logic problems, there are puzzles for all levels, from beginner (John) to expert (Sherlock). With hints and tips for solving the most difficult puzzles, and explanations of how Sherlock (and hopefully you) arrived at them, this is your chance to build your own mind palace. This is your chance to think like Sherlock.