Dream House (2011) on Netflix

In New York, the successful editor Will Atenton quits his job in the GPH Publishers to move to the suburb New Ashford and dedicate more time to his beloved wife Libby and his daughters Trish and DeeDee and to start writing a novel. The family is frightened by a stranger watching them through the window and Will decides to investigate and finds teenagers in a satanic cult in his basement. Soon he discovers that family man Peter Ward killed his wife and his two daughters in that house five years ago. Will goes to the police but the officers do not pay attention to him. He also learns that Peter Ward spent five years in Greenhaven Psychiatric Hospital, but was recently discharged. Will tries to get more information about the murder with his neighbor on the other side of the street, the divorced Ann Patterson, but she refuses to give any information to him. Will decides to go to Greenhaven to get information about Peter Ward and he discloses a dark secret about the former intern that will affect his life in his dream house.