1889. The First Terror. At a boys’ prep school in the Kent marshes, a pupil is found drowned in a pond. Could this be the fulfilment of a witch’s curse from over two hundred years earlier?

1890. The Second Terror. A wealthy man dies of a heart attack at his London townhouse. Was he really frightened to death by ghosts?

1894. The Third Terror. A body is discovered in the dark woods near a Surrey country manor, hideously ravaged. Is the culprit a cannibal, as the evidence suggests?

These three chilling and strangely linked crimes test Sherlock Holmes’s deductive powers, and his scepticism about the supernatural, to the limit.