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Ciphers, Codes and Puzzles Galore in this Math Kids Adventure

Secret writing in the margin of an old book gives The Math Kids have a new puzzle to solve. The clues lead the kids into the mysterious old house that overlooks the town. Is it really haunted like some of the townspeople say?

Fast paced mystery

And who is the man in the long beard who keeps showing up everywhere they go? Jordan, Stephanie, Justin, and Catherine find their problem-solving skills might help them solve a decades-old m...