In The Sisters, we are introduced to Lydia and Ellie, twin sisters who live in a large, isolated house. Their relationship is fraught with tension, particularly due to Lydia's unstable mental state. Lydia, who appears to be the more rational sister, has recently purchased a coffin for herself, claiming a premonition of her impending death. This unsettling decision raises eyebrows, especially when a police officer arrives to question Lydia about the coffin order. He expresses concern over the unusual nature of her request, suggesting that it might indicate suicidal tendencies. Lydia vehemently denies any intention of taking her own life, insisting that she simply knows she will die soon. This declaration sends Ellie into a spiral of fear and paranoia, as she begins to suspect that Lydia's fixation on death may have darker implications.