Can you work out Cluedunnit? Team up with world-famous private investigator Hartigan Browne and help London's Secret, Secret Service (so secret, that even the Secret Service doesn't know about them) locate the whereabouts of a missing agent in possession of the top-secret object known as the Silver Cipher. Use your detective skills to work out:*What clues are hidden in the strange goat painting?*What is important about butterflies?*How can a city map conceal crucial code?Packed full of codes to crack, evidence to evaluate, clues to unravel and maps to navigate, Cluedle - The Case of the Silver Cipher is a funny, mystery puzzle book for code-cracking families and skilful young super sleuths.The perfect activity book for holidays, car journeys and rainy days!Join Hartigan Brown to solve more mysteries in the bestselling Cluedle series with The Case of the Dumpleton Diamond, The Case of the Golden Pomegranate, The Case of Rudolph's Revenge and The Case of the Grindstone Goblet.