Uncle Bunkie, the clown, had every kid in Centerville buzzing. A new amusement park had opened just outside of town- Bicycle Hills. There were all kinds of games for anyone who wanted to have fun on a bike. There were other games, too, like Caves and Cobras- games the children weren't supposed to tell their parents about. But as Halloween approached, children and adults began to wonder if the fun of pretending was getting out of hand. Once again John Bibee spins a fascinating tale as the magic of the Spirit Flyer bicycles confronts mysterious forces trying to take over Centerville.