Deep in the heart of touristy small-town Spirit Canyon, South Dakota, former journalist Zo Jones runs the Happy Camper gift shop, where she sells everything from locally made souvenirs to memorabilia. She even rents out mountain bikes and dabbles in the adventure industry--and sleuthing. It's Memorial Day weekend in Spirit Canyon, and for Zo that means the return of summer shoppers. It also means the return of her good friend Beth, who's moved...