I reviewed and also reccomend the 7 series of Mostly Ghostly books. The first book (Mostly Ghostly: Who Let The Ghost Out? ), is about a boy named Max about the age range of 11-12. He discovers two kid ghosts named Nicky and Tara. They needs Max's help to know about their past. Phears,a terrifying animal traveler is looking for Nicky and Tara. Worst, Max is the ONLY person that can see them. If he dosen't cooperate with Phears and Nicky and Tara, he feels that he will be haunted!!