Divorced mother Lizzy, an emotionally imbalanced woman battling for custody of her son, has her life turned upside down when she crosses paths with Lola, a young girl who she believes to be the daughter she lost six years ago in a hospital fire. Unable to let her suspicions go, Lizzy first stalks and then befriends Lola's mother, Claire, inching her way into Lola's life, to the bewilderment of her own family. Claire grows suspicious on discovering that this strange woman has begun to systematically follow her little girl, appearing everywhere. As Lizzy's obsession heightens and her behaviour becomes increasingly disturbing, Claire confronts her, which brings deeply buried secrets to the surface and the shockingly devastating truth.