It's Halloween in Grimbrook, and Mason and his trusty assistant (and only friend) Iris are ready to cut loose at the Grimbrook middle school dance. But when the discovery of a haunted mirror cuts things short, Mason and Iris are on the case, ready to stand between Grimbrook and their horrible doppelägngers from the mirror dimension! Get ready for more mystery, more magic, and a shocking kiss that could shake things up for our favorite paranormal investigators forever!" -- Provided by publisher.