Terry Pratchett 
Johnny and the Dead 

Sell the cemetery?Over their dead bodies . . . Not many people can see the dead (not many would want to). Twelve-year-old Johnny Maxwell can. And he’s got bad news for them: the council want to sell the cemetery as a building site. But the dead have learnt a thing or two from Johnny. They’re not going to take it lying down . . . especially since it’s Halloween tomorrow. Besides, they’re beginning to find that life is a lot more fun than it was when they were . . . well . . . alive. Particularly if they break a few rules . . .The second book in the Johnny Maxwell trilogy.