The seeing stone / Tony DiTerlizzi and Holly Black.
When Mallory and Jared attempt to rescue Simon from goblins, they use a magical stone which enables them to see things that are normally invisible.
New York :
Simon & Schuster Books for Young Readers,
|Series:||Spiderwick chronicles ;
bk. 2. |
DiTerlizzi, Tony. Spiderwick chronicles ; 2.
Walker Library - Curriculum Collection - Juvenile - 3rd Floor
Pull and Hold