“Sins of the Father” is a great season finale. There are vengeful ghosts causing mayhem and murder via the hands of the living; Rev. Driscoll (Stephen McHattie) returns as a ghost - to finish what he started; the mystery about Audrey’s (Emily Rose) identity and how Dave (John Dunsworth) and Vince (Richard Donat) are involved in the cover up; Duke (Eric Balfour) realizing exactly what being a “troubled” slayer really entails; and of course - romance.