9Step into Sherlock's mind palace to try and solve 165 codes, sequences, logical problems, acrostics, quizzes, enigmas, and more in this official Sherlock book of puzzles. With challenges for all skill levels and explanations of how BBC's Sherlock Holmes might arrive at the solutions, Sherlock fans and puzzlers alike will be eager to find out if they're a match for the brains of 221B Baker Street.