Orphaned twins Freida and Mariah, are en route to their uncle Gustav Weil’s (Peter Cushing!) homestead. What they don’t know of their uncle Gustav, is that he is the head of The Brotherhood, a group of vigilante witch burners scouring evil from the surrounding lands. Once they arrive they are subjected to Uncle Gustav’s tyrannical rule, leading to Freida’s late night scheming to rid herself of her oppressive Uncle. Sneaking out to visit Count Karnstein (Damien Thomas) we learn that one sister has an evil side, as the other remains pure.