The Seeing Stone (The Spiderwick Chronicles, #2)

we said no still you looked
now instead
someone gets cooked

The Grace kids are just beginning to get used to Aunt Lucinda's strange old mansion when Simon suddenly disappears. Jared and his sister have to rely on the help of a mischievous house boggart, a nasty bridge troll, and a loud-mouthed hobgoblin to get him back.