Heine's prose passage in "De l'Allemagne" tells of supernatural young women called the Wilis. They have died before their wedding day and rise from their graves in the middle of the night to dance. Any young man who crosses their path is forced to dance to his death. In another book, the Wilis are said to be jilted young women who have died and become vampires. This is assumed to be the reason that they hate men.