Ostend, Belgium. In a decadent seaside hotel, Stefan and Valerie, a newlywed couple, meet the mysterious Countess Báthory and Ilona, her secretary.

Directed by: Harry Kümel
Written by: Harry Kümel & Jean Ferry & Pierre Drouot
Release date: 1971-10-02
Runtime: 100 minutes
Critics score:
Tagline: These are the Daughters of Darkness… They are waiting for you – They thrive on blood!
Cast:
Fons Rademakers Fons Rademakers
Mother 
Paul Esser Paul Esser
Hotel Concierge Pierre 
Delphine Seyrig Delphine Seyrig
Countess Elizabeth Báthory 
John Karlen John Karlen
Stefan Chilton 
Danielle Ouimet Danielle Ouimet
Valerie Chilton 
Andrea Rau Andrea Rau
Ilona Harczy 
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Also known as:
  • Blood on the Lips
  • Daughters of Darkness
  • The Promise of Red Lips
  • The Redness of the Lips
  • Criaturas de la noche
  • Hijas de la oscuridad
  • Kırmızı dudaklar
  • Solo für einen Vampir
  • Vörös ajkak
  • 闇の乙女