Charley Maplewood has never been one for parties—that would require friends, which he doesn’t have. Well, unless you count his monster friends, but they’re only imaginary. But now that he’s turning ten—the big one-oh—he decides to throw a birthday party for himself, complete with a “House of Horrors” theme. Of course things don’t work out as he plans. Will Charley be able to pull it together before the big one-oh . . . becomes the big OH-NO!?