The Further Adventures of Sherlock Holmes

Sherlock Holmes and his cousin, Dr Henry Vernier, travel to Whitby, to investigate a case on behalf of a client. He has fallen in love, but a letter has warned him of the woman's druidic curse. Locals speak of a green glow in the woods at night, and a white apparition amongst the trees. Is there sorcery at work, or is a human hand behind it?