A body vanishes. Can you solve the case before the cold room claims another secret? A killer hides in the numbers. THE COLD ROOM is more than a sudoku puzzle book — it's an interactive mystery sudoku experience where every puzzle unlocks a new piece of the story. In the locked basement of Ashford Medical Centre, Detective Inspector Daniel Voss investigates the disappearance of a body, a suspicious death, and a trail of clues hidden inside 100 carefully crafted sudoku puzzles. Nothing adds up until the numbers start talking, and no experience with crime fiction is required — just patience, curiosity, and a sharp eye for detail. Each chapter fuses gripping narrative with logic-based challenge, making this both a sudoku book with narrative and a true detective puzzle book. Solve ten sudoku puzzles, uncover the cipher letters, and reveal the chapter's hidden phrase before moving deeper into Voss's investigation. As the case unfolds in this cipher puzzle book, secrets surface, motives shift, alibis crumble, and the truth behind the cold room becomes harder and harder to ignore. Every grid you complete is a step closer to the answer — and every answer raises a darker question. Read more