The Ghost Juggler - Morrison, Nona Brooks

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Résumé :
Ghosts? Fighting? In his attic? Zack has no friends in his new town, he's failing math, and school bully August Short has declared his intention to do away with him. Just when it seems things can't get worse, the old farmhouse his family has bought turns out to be haunted. His family can't see them or hear them, but Zack isn't worried about them. He thinks ghosts seem safer than anybody at Turner Junior High. He assumes that several ghosts in a house must be related. Not so. These ghosts didn't even live in the same era. They don't get along with each other. And they've chosen Zack to be their mediator. He can barely manage his own life. He doesn't need to play counselor to a bunch of neurotic smoke signals. Still, they do seem to have a lot of problems and they're persistent. Before he can say Boo! he finds himself dealing with errant alarm clocks, ghostly convocations, and a boy trapped forever in his underwear. When August Short, a new ghost, and math problems overlap, Zack has to find a way to solve it all.