Enemy at Green Knowe

In An Enemy at Green Knowe (1964), the series takes a darker turn. Both Tolly and Ping are staying at Green Knowe. Mrs. Oldknow tells them the story of Doctor Vogel, a tutor and necromancer who came to a diabolical end at Green Knowe centuries before. The next day, Professor Melanie D. Powers appears, on the hunt for Vogel's occult papers. Professor Powers' interest is far from academic, however, and a mounting confrontation between the holy magic of Green Knowe and the forces of Evil commences.