Ew!! What's that smell coming up from the river into Neighbor Bill's backyard? Could it be? Then a terrible scream! Then another!! Only an investigation can solve this mystery. And it will require some expertise to be solved. Balls of fur that used to be rabbits found tucked away in a shale rock cave next to the river. Evidence of what? No, it couldn't be, could it? Paul and Andy along with their new friends Chris and Colin must figure this mystery out. Join the boys in a wonderful hunt in and around a river called the Olentangy, a Delaware Indian word pronounced Olen-tan-gee that means river of the red face paint. Follow the boys as they learn about enduring friendships and a creature known to inhabit the woods who goes by the famous name of Bigfoot.