The Vampire Lovers (1970).
Classic Hammer film based on the story of Carmilla and starring Ingrid Pitt as Mircalla Karnstein worming her way into the homes of the aristocracy and feeding off the blood of young girls.
Including Emma Morton (Madeline Smith) who she plans to seduce and make her a vampire as well.
Definitely one of the best of the later day Hammer films and with a superb performance from Pitt who is just perfect in the role.
It's got a great gothic atmosphere as well with good sets and costumes. Also bold for its time for its depiction of lesbianism and nudity.
Also co-starring Peter Cushing as General von Spielsdorf. Although, he isn't on screen very much. His part is a little more than a walk-on, but he adds his usual authoritarian presence.
Highly recommended 8.5 out of 10.