Mallory Grace and her family move to a new home, where her brother, Jared, discovers a brownie living within the home's walls and a group of mean goblins trying to steal the secret book the brownie is protecting.
Thimbletack, a brownie who protects a precious book from ogres and goblins, is mad when the Grace family moves into his quiet home, disturbing Thimbletack's peace and threatening the safety of the book.