Chloe, a young mother who is in a relationship with Alex, finds her life flipped upside down when Chloe's younger sister, Sadie, returns home after a protracted absence for which no reason is given. Sadie is a deeply troubled young woman who harbors a nefarious plan concerning anyone who comes between her and her older sister. Despite the fact that she appears to want to move in with her sister and her niece, who is now 17 years old and becoming quite a handful herself, Sadie is, in reality, becoming quite a handful herself.