These activity books from Melissa & Doug let kids play spy games and solve mysteries with magic ink, red-lens technology or a secret decoder wheel.
- Codes to crack, puzzles to solve & more
- Everything stores neatly within the tab-close covers
- Secret Decoder Game Book
- The Case of the Slippery Flippers Book
- The Case of the Runaway Ruby
- Includes: 3 18-page books
- Age: 7 years & up
- Model number: 93188
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