Like many horror films, Know Fear begins with a house – a house with a dark past.  Shortly after Wendy (Amy Carlson) and Donald (David Alan Basche) move into the house, Wendy begins experiencing strange sensations that overwhelm her.  The family learns that Wendy has been possessed by a demon, and the only way to save her is to use a book to enact a ritual that will allow different members of the family to…