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A trip to the museum turns into a dangerous rescue mission when a secret passageway leads you to a strange land. You are forced to face terrifying creatures, an ancient city under siege and the mystery of One Knight Too Many. This intriguing story is a totally engaging new way to build arithmetic skills. The clever mystery is filled with math problems; solve the equations to work your way along the pathway that runs through the book, bringing you one step closer to solving the riddle at the end! Click to learn more about the Mathfinder series! Download Lesson Plan