The Idea Factory - The Blood of the Devil
In a small village, a father is starting to hear voices that aren't there. They tell him that his two daughters have turned to the devil. One of the daughters has a new boyfriend, a stranger who recently arrived in the village. As the father loses his senses, he eventually poisons his daughters to save their souls. In the process, the daughter with the boyfriend becomes a vampire, because the boyfriend is a vampire. The other daughter was working with the local priest to defeat the vampire. But with her dead, the now two vampires ravage the town, killing everyone there.