Danger is everywhere in the thrilling fourth installment of this bestselling series.
It’s Halloween. But not for Morton, who’s trapped in Elsewhere. Good thing Olive has a plan: Swallowing her dread of the McMartins, she sneaks Morton out and takes everyone trick-or-treating. But when they’re followed by a creature who’s not all he seems, they’re in for a surprise—something, or someone, is living in Mrs. Nivens’s abandoned house. Yes, strangers have come to Linden Street. And though they claim to be her allies, Olive has a bad feeling. She returns home late Halloween night to discover something worse: Her parents are gone.
Desperate to get them back, Olive strikes an unbalanced bargain with Annabelle McMartin and loses something incredibly valuable in the process—something that could mean doom for the house, and for Elsewhere itself. Will she put her faith in her own worst enemies to save the people and the home she loves?