In Noctus Sol

This is a supernatural horror story that deals with a financially struggling family moving in with their maternal grandmother for a summer. The house turns out to be haunted but no one except the mentally handicapped uncle and the two young brothers believe this. The grandmother seems to believe it but does not care. The ghosts are always present and watching. Several supernatural/strange events occur until finally one night the parents and some of their AA friends decide to hold a seance for fun. The seance is a disaster.