A woman becomes very curious about one of her psychiatrist husband’s inmates, a man who was found guilty in the murder and disfigurement of his former wife.

When several young girls are found dead, left hideously aged and void of blood, Dr Marcus suspects vampirism. He enlists the help of the Vampire Hunter. Mysterious and powerful, Kronos has dedicated his life to destroying the evil pestilence. Once a victim of its diabolical depravity, he knows the vampire’s strengths and weaknesses as well as the extreme dangers attached to confronting the potent forces of darkness.

A Scotland Yard Detective (Peter Cushing) must investigate a series of murders perpetrated by a giant blood-sucking moth that can take human form.