Cooper thought living at a campground would be cool. But summer's turning out to be all chores, no fun. Cooper's only bright spot is his new friend, Packrat, a guy who carries the world in his coat pockets and leaves his troubles behind. But trouble has come to the Wilder Family Campground and Pine Lake, where a family of loons is trying to build a nest. Someone is out to harm the loons. Is it the bully with a chip on his shoulder? The irritable camper with a shady past? Or the publicity-seeking reporter? It's up to the boys to figure out who, why, and how to stop the culprit – before it's too late.