When choosing a summer camp, sometimes the name can say it all. And if the camp happens to be called Spirit Moon, well, there might be a bit of supernatural influence. Under the guidance of Uncle Marv, the camp's goofy, offbeat counselor, brothers Harry and Alex have an unforgettable summer that they certainly wish they could forget. They find Uncle Marv is quite the practical joker, staging a pretend disappearance of all the other campers just to spook Harry and Alex. But Marv's "ghost stories" around the campfire turn out to be based in pure fact, confirmed when Harry and Alex's fellow campers begin to spontaneously lose appendages.