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When Stephanie Lewis finds secret writing in the margin of an old book in the library, The Math Kids have a new puzzle to solve. But first, they'll have to learn about codes and ciphers and how they can use their math skills to solve them. As one clue leads to another, the kids are drawn into the mysterious old house that overlooks the town. Is it really haunted like some of the townspeople say? And who is the man in the long beard who keeps showing up everywhere they go?But that's not their only problem. The town's financial problems might mean the cancellation of the math competition they've worked so hard for. Jordan, Stephanie, Justin, and Catherine will need to use all their problem-solving skills to figure out the clues before it's too late.

Jordan and Justin are best friends and the only two kids in their class's advanced math group. So it isn't until Stephanie Lewis marches into their classroom that they meet someone who's as good with numbers as they are. Their shared interest in math quickly draws them together, and the three soon form The Math Kids. Unfortunately, life as math club kids isn't always easy. In addition to extra homework, the three friends have two new problems. First, a string of mysterious burglaries has the whole neighbourhood on edge, including their parents. Then, they manage to earn unwanted attention from Robbie, the class bully. Luckily, Jordan, Justin, and Stephanie soon learn that their new club may give them the skills they need to solve both problems.

A Mysterious Will Launches The Math Kids Into Their Riskiest Adventure Yet!When FBI Special Agent Carlson is kidnapped while investigating the plane crash of Willard Howell, an eccentric billionaire inventor, the Math Kids spring into action. If Catherine, Stephanie, Justin, and Jordan can figure out the Great Triangle mentioned in Howell's will, they might just uncover who's behind the crash and Agent Carlson's kidnapping-if they don't get caught themselves!This Middle Grade Book- introduces readers to mathematical patterns- features an action-packed plot with international intrigue- includes an appendix for hand-on learning