US thriller starring Katherine Heigl as a divorcee who tries to ruin her husband's new relationship. Tessa Connover (Heigl) is devastated when her husband David (Geoff Stults) divorces her and takes their young daughter Lily (Isabella Rice) with him. Struggling to cope with the separation, Tessa is pushed over the edge when David announces his engagement to his new partner Julia (Rosario Dawson). Jealous and angry that Julia has replaced her as a loving wife and mother, Tessa decides to fight back but becomes pathologically violent and her methods turn increasingly sinister as she begins her campaign of torment against Julia...