The Cipher of the Starlight Keeper

When astrophysicist Iris Halloway disappears from her clifftop cottage in Laugharne, she leaves her granddaughter Wren a brass star chart, a locked tablet and a trail of secret codes. You are Wren, and the story only moves when you solve the puzzles. Every answer tells you which page to turn to next.

Inside the book

• 43 original puzzles woven into one mystery
• Secret codes: shift codes, Morse, mirror code, keyword ciphers, Polybius squares, binary and an original star-pen code
• Maths problems: sequences, gears, angles, timetables, magic squares and number pyramids
• Logic and word puzzles: logic grids, sudoku, mazes, anagrams and word ladders
• 3 different endings, plus dead ends and Wrong Turn pages that send you back to try again
• A Codebreaker's Toolkit, a Starlight Log, hints and full answers at the back

Like an escape room in a book, for curious 12 to 15 year olds who love mysteries, codes and a real challenge.