Can you work out Cluedunnit? Team up with world-famous private investigator Hartigan Browne and solve 60 fun brain-busting puzzles to help the headmaster of Grindstone Academy (the most prestigious school in the English countryside!) recover their prized possession: the Grindstone Goblet. Use your detective skills to work out:* Why have all the books in the library been moved?* What is the treasure of immense worth?* Can the key to finding the Gleaming Goblet be found in a poem from William Shakespeare’s Macbeth?Packed full of codes to crack, evidence to evaluate, clues to unravel and maps to navigate, Cluedle - The Case of the Grindstone Goblet 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 Browne 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 Silver Cipher.