The Spiderwick Chronicles: The Field Guide by Tony DiTerlizzi and Holly Black

After Jared, Simon and Mallory Grace’s parents divorce, their mother moves them to a crumbling Victorian house owned by their now-institutionalized Aunt Lucy. The children hear scratching inside the walls and discover a nest. Then Mallory urges Jared to ride in a dumbwaiter, and he finds a secret upstairs library containing strange books. The children recover a volume compiled by Arthur Spiderwick (Aunt Lucy’s father) about fairies and determine they’ve angered one type called a boggart. They finally rebuild the boggart’s nest and set him at ease — but it’s clear Spiderwick’s book will lead them to other adventures.