The Vengeance of the Witch-Finder

Something evil has taken over. Lewis Barnavelt and his uncle are in England, visiting a cousin at Barnavelt Manor. Lewis quickly becomes friends with the housekeeper's son, and as the two boys explore a garden maze, Lewis accidentally unleashes demonic forces that summon the ghost of an evil wizard bent on destroying his entire family. Can Lewis fight the maniacal wizard, or will all the Barnavelts perish?