The hunt is on. While playing on a beautiful summer day Wyatt Nystrom and his dog Benny find a tennis ball with a mysterious message. The ball is just the hook to get kids like Wyatt and his cousin Danni involved in a journey upstream to unravel the madness of the Brandywine. With the help of creek pals throughout the watershed and numerous hands-on activities throughout the story Wyatt and Danni discover a community of natural wonders scientific studies folklore and crazy characters all brought together by a remarkable creek. This is a story that not only engages the reader with its plot but also with its interactive approach. It's a novel and an entertaining way to learn about watershed science.