Twins of Evil (1971)     
   
Directed by John Hough

Writing credits: 
Tudor Gates 
Sheridan Le Fanu (characters) 
 
Cast:
Peter Cushing ....  Gustav Weil 
Dennis Price ....  Dietrich 
Mary Collinson ....  Maria Gellhorn 
Madeleine Collinson ....  Frieda Gellhorn 
Isobel Black ....  Ingrid Hoffer 
Kathleen Byron ....  Katy Weil 
Damien Thomas ....  Count Karnstein 
David Warbeck ....  Anton Hoffer 
Harvey Hall ....  Franz 
Katya Wyeth ....  Countess Mircalla 
Alex Scott ....  Hermann 
Judy Matheson ....  Woodman's Daughter 
Luan Peters ....  Gerta 
Shelagh Wilcocks ....  Lady in Coach 
Inigo Jackson ....  Woodman 

Synopsis:
In nineteenth century middle-Europe, orphaned teenage 
twins Maria and Frieda go to live with their uncle 
Gustav Weil who heads the Brotherhood, a vigilante 
group trying to stamp out vampirism.