Ghosthunters and the Incredibly Revolting Ghost - by Cornelia Funke
What's the difference between an ASG (averagely spooky ghost) and an IRG (incredibly revolting ghost)? That's one of the first things young Tom learns when he becomes a ghosthunter. He didn't PLAN on hunting ghosts, but when he finds an ASG living in his family's cellar, he doesn't have much choice.
This is a pretty funny book, the first in a series by the amazing German author of such books as Inkheart, The Thief Lord, and Dragon Rider. Tom gets help from his annoying older sister and his grandma's friend, and joins a mission to rid a house of a pretty freaky ghost. Read this if you like ghost stories, funny books, icky freaky scary things, and young characters who have to be brave and solve some big problems without getting attacked by Incredibly Revolting Ghosts.