Since there are a few different things called "The Night House,"

: Beth (Hall) is a teacher grieving her husband Owen’s sudden suicide. As she lives alone in the lake house he built, she discovers he was keeping dark secrets involving architecture, the occult, and women who look exactly like her.

: The film is a metaphor for depression and the void of grief . The entity "Nothing" represents the emptiness Beth feels, which Owen tried to keep away from her through dark rituals.