This famous TV program was liberally based on the novel by Nathaniel Hawthorne (The Marble Faun). The main characters are inexplicablyy pursued by a mysterious entity who appears to them in the Roman catacombs dressed in a black mantle and hood. The plot begins with Kenyon's rescue of an anonymous diary from the 19th century where the figures of four friends similar to Kenyon, Miriam, Hilda and Donatello are mentioned. They seem to be condemned to re-live a mystery which had happened 100 years before.