The secret world around the Spiderwick Estate is far more dangerous than the Grace children ever imagined. When goblins ambush the woods and snatch Simon, his brother Jared and sister Mallory are thrust into a desperate rescue mission. Their only advantage is a magical artifact known as the Seeing Stone, a rare object that pulls back the veil on a hidden, treacherous landscape. Looking through the stone allows Jared and Mallory to track creatures that are normally completely invisible to human eyes. As they plunge deeper into the perilous forest surrounding their great-aunt's Victorian home, they must outsmart vicious goblins and navigate a world where a single misstep could cost them their brother. The magical creatures they encounter are not the friendly fairies of bedtime stories, but cunning adversaries intent on protecting their realm. The siblings must rely on their wits, their courage, and Arthur Spiderwick's mysterious guide to survive the deadly forces closing in around them.