When eleven-year-old Ash Merrill discovers a hidden house in his home town, his life takes an exciting turn. Quintus Bowen, the owner of the house, and an ancient journal, which he inherits from an unknown relative, tell him the story of his ancestors and of the Bowen Family. This is just what Ash has longed for; an adventure! But the more he learns the more questions arise. He gets his answers when a classmate dies and Quintus Bowen tells him of The Mystery of the Blue Moon.