Explore the world of espionage with the Yes & Know Invisible Ink Mr. Mystery Secret Agent Spy & Game Book. This interactive book is perfect for all ages and features a fun spy-themed storyline that will keep you engaged for hours. With invisible ink pens included, you can solve puzzles and uncover secret messages throughout the book. The multi-color design and spy character family make this book a great addition to any game collection. Perfect for family game night or solo play, this book is sure to provide hours of entertainment. Get your hands on the Yes & Know Invisible Ink Mr. Mystery Secret Agent Spy & Game Book today!