A gripping psychological mystery by Lisa Jewell that weaves together family secrets, suspense, and gothic atmosphere. The story begins when Libby Jones, on her twenty-fifth birthday, learns that she has inherited a grand mansion in London's wealthy Chelsea neighborhood.

Twenty-five years earlier, police discovered three decomposing bodies inside the abandoned house. The only survivor was a healthy ten-month-old baby—Libby herself. As she begins investigating her past, the novel alternates between multiple perspectives, gradually revealing the disturbing events that unfolded inside the mansion.

The house had become home to two families living under the influence of a charismatic and manipulative couple whose control over the household led to psychological abuse, isolation, and tragedy. As Libby uncovers the truth, long-buried secrets emerge, and the lives of those connected to the house collide in unexpected ways.

Rich in atmosphere and emotional depth, The Family Upstairs is a slow-burning mystery that blends psychological suspense with family drama, culminating in a series of satisfying revelations.