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Grab a pencil and join P.I. Hartigan Browne in the vibrant, bustling city of London to unravel riddles, crack codes, and catch the culprit in the third installment in this fun, interactive puzzle adventure series. Can you figure out Cluedunnit? World-renowned Private Investigator Hartigan Browne has been contacted by London's Secret Secret Service (so secret, that even the Secret Service doesn't know about them) to help locate the whereabouts of a missing agent who was last seen in possession of a top secret object known as the Silver Cipher. Finding the Cipher is a matter of national security, and will take reader-detectives on an armchair adventure as they track clues that will lead them to famous landmarks such as the London Eye, Trafalgar Square, the Natural History Museum, and Buckingham Palace. Along the way, readers tackle 60 brain-busting puzzles, each holding a clue to solving the larger mystery. Where has Agent Cade gone missing? Which painting holds the clu