They appear at various points in the novel, but their most significant roles are:
* Transilvanya'da: They are first introduced as the three women who tempt Jonathan Harker in Castle Dracula. They are depicted as seductive and dangerous, and they feed on him.
* Londra'da: They later reappear in London, where they attempt to lure Lucy Westenra, one of the novel's main characters.
Geleneksel anlamda "cadı" olarak tanımlanmasalar da, kesinlikle kadın ve erkekleri avlayan tehlikeli ve yırtıcı figürler olarak sunuluyorlar.