Willow and her brothers, Elon and Linden, want to build the best science fair project ever, and their plan to build a quadcopter that can fly itself is sure to win. But they're up against stiff competition, including Willow's best friends.The science fair takes an unexpected backseat when students at Mt. Hood Elementary start getting sick, including Willow. Everyone thinks it's just a stomach flu, but Willow suspects there's something wrong with the school lunches.Willow, Elon, and Linden will have to work together, using their autonomous quadcopter and all their detective skills to trace their food back to its source to solve The Case of the Wilted Broccoli.