Book 3 - Cul-de-sac Kids: The Sceince Fair  

Book 3

      Zach Prescott is eleven-years old, and excited to enter the sixth grade science fair at his new middle school. He knows this might mean that he has less time for his friends around the neighborhood, but he's never minded doing his own thing every once in a while, whether it's building his tree house or working on one of his inventions. With Halloween fast approaching, he puts all of his energy into preparing for the science fair, determined to come up with a science project unlike anything the kids at his school have ever seen. 

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Cul-de-Sac Kids (3 book series) Paperback Edition (amazon.com)