Before we even meet the Harmon family, they've been through a lot. Dr. Ben Harmon, a psychology professor, just had an affair with Hayden, one of his students, and his wife Vivien has recently gone through a miscarriage. All this has taken its toll on their daughter Violet, who suffers from depression. They move across the country to try for a new beginning, but soon discover that the house they've bought has a frightening past: the previous owners died in an apparent murder/suicide, the mother-daughter duo, Constance and Addie, who live next door, have some secrets to hide, and Larry Harvey, a former tenant covered in burn scars, keeps giving the family cryptic warnings.