i cant remember the name of this book help!!!?

So its about this kid and for some reason he goes to live with his grandmother who lives out in the country. And she lives by a cemetery and one day the kid is in the cemetery and he finds a bag of money and he is trying to figure out what the money is for and it involves like a ghost and stuff. Its kind of a kid book, its between 200 and 400 pages and i think the title had "ghost" and the title was yellow, the picture on the cover involved a headstone and the cover had green on it. I can remember on like the first day he gets to his grandmas there is a bat in his grandmothers house so the grandmother gets her shotgun and shoots it. =P thats really the only clear memory i have of the book. Please if you have even the slightest idea let me know cause i could be wrong about some of the details!