I enjoyed this film and was frankly quite surprised at all the negative reviews although I certainly agree that the ending was unsatisfactory. It would also have improved the film had there been a plausible explanation for the power outage and perhaps, some additional scenes of the effect of the outage on a larger town or city. Nevertheless, the actors were quite good and it seemed to me that there was a certain nervous tension existing throughout the movie due to the vulnerability of the two sisters living alone.