Phantasmagoria is a Big Finish Productions audio drama based on the long-running British science fiction television series Doctor Who.

Carteret is then approached by the sinister Sir Nicholas Valentine (introduced as a scholar, landowner and astrologer), and they agree to play cards.

They are confronted by the home's owner, Dr Samuel Holywell, whom they deduce to be an antiquarian; they explain their presence on the pretext that they were delivering him the Tardis to form part of his collection.

That evening, while the Doctor and Turlough are being entertained by Holywell, Jeake and Flower are robbed by Major Billy Lovemore (a highwayman) and lose their winnings from the previous night.

Inside the house, Holywell informs the doctor that he has practical proof of the existence of ghosts and is in regular contact with them.

Before Turlough can fight save Hannah from Cotton, they are distracted by a man running towards them as if chased invisible pursuers; he drops dead with a playing card in his hand.

Holywell discovers that a spate of young men in their prime disappearing in the area has happened every thirty years and finally connects this with the Diabola Club.

Hannah returns and reveals herself to be the same person as Lovemore and an alien, but justifies her criminal life as a response to the gender stereotypes of the era.

She goes on to disclose that Valentine is in fact Carthok of Deodalis, a deranged tyrant who escaped execution; she has been hunting him in revenge for the death of her family at his hands.

The Doctor and Holywell confront Valentine, who admits his true identity the murder of Fry/Lovemore's parents, and explains that he needs the consciousness of his victims to power his bio-mechanical ship to escape from the earth where he has been trapped.

The Doctor pleads for her life in exchange for what he claims is an item of great power but is in fact his Almanack (which he refers to as "the Wisdens").

He pretends to try to escape with the Almanack, and when Valentine/Carthok opens the book he touches the concealed card-trap and the consciousness/spirits he uses to capture his victims turn on him and kill him, led by Fry/Lovemore who also dies in the struggle.