The Ghosts in the Clouds: Book 4

Mr. Snarf has been a bad ghost. He hasn't scared people. In fact, he's even made friends! Now some grumpy ghosts are taking him away from Hotel Strange. Can the hotel's other residents rescue him? Hotel Strange is inhabited by an odd and lovable collection of characters: Kaki, a lazy purple fluff ball; Monsieur Snarf, a ghost and concierge; Monsieur Léclair, a bookish rat; and Marietta, a young girl. Along with their helpful neighbor Célestin, they have a variety of delightful adventures.