DINK'S FAVORITE MYSTERY WRITER, WALLIS WALLACE, HAS INVITED DINK, JOSH, AND RUTH ROSE FOR A SLEEPOVER - IN A HAUNTED CASTLE! BUT AS SOON AS THE YOUNG DETECTIVES ARRIVE, THEY START HEARING SCREAMS BEHIND THE WALLS. WILL THEY DISCOVER WHO - OR WHAT - IS HAUNTING MOOSE MANOR?