Bill and five students sign a contract with a mysterious Landlord to live in his manor house. After helping Bill move her things in, the Doctor becomes suspicious of the nature of the Landlord. A number of the students mysteriously disappear and the group are separated. The Doctor along with Harry, one of the students, discover a strange cockroach-like creature which the former nicknames “Dryads”.
There is is nice build up of tension and suspense as the strange incidents in the house unfold. Then in the final act with a twist it turns into a tragedy. Not really a satisfying ending for a horror genre episode.