Two students, Elvira and her friend Genevieve, go searching for the tomb of medieval murderess (and possible vampire) Countess Wandessa. They find a possible site in the castle of Count Waldemar Daninsky, who invites them to stay for as long as they like. When he shows them the tomb of the countess, Elvira accidentally revives her.
La Noche de Walpurgis (translated as Walpurgis Night) is a 1971 Spanish horror movie starring Paul Naschy that is the fourth in a series about the werewolf Count Waldemar Daninsky. The film was directed by León Klimovsky and written by Naschy and Hans Munkel.
The film has been issued in many different versions, and is also known as Werewolf Shadow, Blood Moon, and The Werewolf Vs. Vampire Woman.