After Ben Ravencroft, a famous horror writer of whom Velma Dinkley is a huge fan, assists her and the Mystery Gang in solving a case at a museum, he invites them to his hometown, Oakhaven, Massachusetts. When they arrive, they find the town converted into a tourist attraction by Mayor Corey, complete with 17th-century replicas and attractions based on the alleged ghost of Sarah Ravencroft, an ancestor of Ben's who was persecuted as a witch and executed by the Puritan townspeople in 1657. Ben disputes this, claiming Sarah to be a Wiccan who used natural herbs to heal people and reveals for years he has been searching for Sarah's medical journal to prove her innocence.