The week's only horror movie belongs to that moribund branch of the genre, the "found footage" picture. In this low-budget case, it purports to be a film assembled by the Spanish police from crude amateur footage shot by a middle-class boy and his sister investigating some mysterious happenings in a wood outside their newly restored house in Sitges, a town famous for its annual festival of horror and fantasy flicks. Mayhem occurs over a succession of nights, and yawns precede dawns.