Could one of the two middle-aged sons of the famous Lady Sybil be a deranged serial killer - and, if so, which one?

In Venice in the 1800's, a British gentlemen befriends a mysterious woman whose presence seems almost other worldly to him.

A repressed, neurotic Englishman (Jeremy Brett) becomes obsessed by a mysterious beauty (Lesley-Anne Down). Is she all she seems? Is he?

An unhappy child in an affluent but dysfunctional Victorian household acquires both a sharp-eyed new governess and a new, unusually large doll, by which she is strangely fascinated.

Four distinguished visitors arrive separately at the castle of the beautiful, widowed Countess Ilona, whom they have not seen for many years. But she has surprises in store for them...

A British literary critic and his family visit the Villa Diodati in Switzerland, where, decades earlier, Mary Shelley wrote "Frankenstein". Events indicate that perhaps the famous story was not just a work of imagination...

A young man describes his amorous encounter with, and escape from, a vampiric lady in Eastern Europe. But if this all happened so long ago, why does the storyteller still seem so youthful?

Having lured the four men who ruined her life to her isolated castle in "the remotest corner of that part of my country the prudent traveler never visits", the Countess Ilona exacts a terrible revenge.