Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Psychological suspense with a supernatural flavor

Joan Hapgood has a cozy, comfortable life at Hapgood Farm withher husband Bill and son Matt (from a previous relationship). That is, until the day her aging and increasingly senile mother, Emily Moore, sets her house on fire and Joan brings her to live at the farm. Emily is the mother from hell and makes life [extremely] intolerable for Joan's family. .... The psychological suspense is unrelenting as John Saul leads the reader through a tangle of fractured relationships, unearthly jealousy, repercussions of child abuse, fragile egos, and injured psyches held together with blood revenge. It becomes pretty clear in the last quarter of the book what's going on, but the ending will still sucker-punch you. There aren't many books I feel compelled to finish the same day I start them. This was one of them.