House (1985)

The successful writer Roger Cobb is trying to write a book about his experience in Vietnam, but he is blocked after the disappearance of his son Jimmy and the divorce from his wife, the actress Sandy Sinclair. When his beloved Aunt Elizabeth is found dead hanged in her bedroom, Roger inherits the house and moves to live there. His snoopy neighbor and fan Harold Gorton gets close to Roger and learns that his aunt claimed that the house is haunted. Further Jimmy disappeared in the swimming pool on the back of the house. While writing his memories from the Vietnam when his pal Big Ben was captured and tortured by the Vietcong, weird things happen in the house and soon Roger learns that the place is a gateway to a hellish dimension.

IMDb: https://www.imdb.com/title/tt0091223