Twins of Evil

Twins of Evil is a 1971 horror film by Hammer Film Productions starring Peter Cushing, with Damien Thomas and the reallife twins and former Playboy Playmates Mary and Madeleine Collinson.

Maria and Frieda, recently orphaned identical twin teenage girls, move from Venice to Karnstein in Central Europe to live with their uncle Gustav Weil. Weil is a stern puritan and leader of the fanatical witchhunting Brotherhood. Both twins resent their uncles sternness and one of them, Frieda, looks for a way to escape. Resenting her uncle, she becomes fascinated by the local Count Karnstein, who has the reputation of being a wicked man.Count Karnstein, who enjoys the Emperors favour and thus remains untouched by the Brotherhood, is indeed wicked and interested in Satanism and Black Magic. Trying to emulate his evil ancestors, he murders a girl as a Human Sacrifice, calling forth Countess Mircalla Karnstein from her grave. Mircalla turns the Count into a vampire. ........

Source: Wikipedia