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Line Up: Mr. Mystery - Invisible Ink Secret Agent

Use your special invisible ink pen to uncover secrets and solve mysteries. With the Mr. Mystery secret agent books, you'll decode cryptograms, decipher krazygrams, and reveal hidden spies with your secret pen. 

  • Includes invisible ink pen
  • 48 pages of activities
  • Recommended for ages 7+
  • Measures: 6" x 11"