The fourth and latest book in the series, DORY FANTASMAGORY: Head in the Clouds (Dial, $15.99, ages 5 to 8), will have fans rejoicing that Hanlon’s hybrid formula is still going strong. Dory faces obstacles both mundane and enchanted, and surmounts them all. She dumps an objectionable winter coat and devises a pretend game to captivate a weepy friend. After losing her first tooth, she recognizes the Tooth Fairy, shopping incognito, and chases her through a grocery store. And in perhaps her greatest triumph in the series so far, she foils the evil plan of her imaginary nemesis, Mrs. Gobble Gracker, to take over that benevolent spirit’s nightly visits.