The Lost Crown

When a stone conservator finds strange masons' marks hidden behind old plaster at Caernarfon Castle, then vanishes, the hunt is on. You are Wren Halloway, Keeper in training, and you must follow the trail through Conwy, Beaumaris, Harlech and Caerphilly before Umbrella Dynamics gets there first.

Inside the book

• 43 original puzzles woven into one mystery
• Secret codes: pigpen, heraldry shields, Morse, shift codes, keyword ciphers and an acrostic verse
• Lots of maths: fractions, area, angles, gear ratios, Roman numerals, train times and a tide table
• Logic and word puzzles: a crossword, a 9 x 9 sudoku, logic grids, a knight's-move path and castle anagrams
• Real castles and real history, with a few Welsh words to crack along the way
• 3 different endings, plus dead ends and Wrong Turn pages that send you back to try again
• A Codebreaker's Toolkit, a Crown Log, hints and full answers at the back

Book 2 in the Codebreaker Gamebooks series, and it reads perfectly on its own.