Set during the 17th century in Styria, identical twin sisters Maria and Frieda Gelhorn move from Venice to Karnstein in Central Europe to live with their uncle Gustav Weil after becoming recently 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.
