Twins of Evil

Twins of Evil (also known as Twins of Dracula) is a 1971 British horror film directed by John Hough and starring Peter Cushing, with Damien Thomas, real-life identical twins: former Playboy Playmates Madeleine and Mary Collinson, Isobel Black, Kathleen Byron, Dennis Price and David Warbeck. This was the Collinson sisters' final acting roles.

It is the third (and final) film in the Karnstein Trilogy, based on the 1872 novella Carmilla by Sheridan Le Fanu. The film has the least resemblance to the novella and adds a witchfinding theme to the vampire story. Much of the interest of the film revolves around the contrasting evil and good natures of two beautiful sisters, Frieda and Maria. Unlike the previous two entries in the series, this film contains only a brief lesbian element.

The film was released in the U.S. as a double feature with Hands of the Ripper.

Set in historical Styria, identical twin sisters Maria and Frieda Gelhorn move from Venice to Karnstein in Central Europe to live with their uncle Gustav Weil after recently becoming orphaned. Weil is a stern Puritan and leader of the fanatical witch-hunting 'Brotherhood'. Both twins resent their uncle's 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 Emperor's 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 the vampiress Countess Mircalla Karnstein from her grave. Mircalla turns the Count into a vampire.

Frieda, following an invitation from the Count, steals away to the castle at night, while Maria covers for her absence. In the castle, the Count transforms Frieda into a vampire, offering her a beautiful young chained victim. Returning home, Frieda threatens Maria to keep covering for her nightly excursions, but she also secretly fears she might bite Maria, who would not survive due to her innocent nature.

Meanwhile, Maria becomes interested in the handsome young teacher, Anton, who is initially infatuated with the more mysterious Frieda. Anton has studied what he calls "superstition", but becomes convinced of the existence of vampires when his sister falls victim to one. One night, when Frieda attacks a member of the Brotherhood, she is captured by her uncle and put in jail. While the Brotherhood debates the vampire woman's fate, the Count and his servants kidnap Maria and exchange her for Frieda in the jail cell. Anton goes to see Maria, not knowing that she is actually Frieda. She tries to seduce him, but he sees her lack of reflection in a mirror and repels her with a cross. Anton rushes to rescue Maria from a burning. Maria kisses a cross, revealing her innocence.

Weil now listens to Anton's advice on hunting vampires, and the two men lead the Brotherhood and the villagers to Castle Karnstein to destroy the Count. The Count and Frieda attempt to flee, but they are surprised by Weil who captures Frieda and decapitates her. The Count captures Maria, but Weil appears with an axe. Weil challenges the Count and is killed. Anton seizes his chance and pierces the Count's heart with a spear. Maria and Anton reunite while Karnstein crumbles to corruption.