Ever since his dad died, Dennis has been seeing ghosts. Lots of them. There's been a veritable ghost parade through his room.Often they are ghosts he knows, and most are friendly, so Dennis doesn't mind-but it would be nice if someone else could see them, or at least believe that he sees them.But now a new ghost has arrived, and he's as eccentric in the afterlife as he was in real life. It's his uncle Arvie, and he seems to want something, but he talks in puzzles. He keeps talking about "boodled trampolink." Dennis would love to help him "dunder" it, if only he knew what that meant.Arvie will be a hard ghost to have around.