A decade after her three children were murdered by her ex-husband, Liz has managed to build a new life for herself. But now, driven by her failure to protect her own children, she has become committed to save 4-year-old Lilly from a life of abuse. Margaret is an overprotective single mother of a rebellious teenager. When her daughter goes missing after a heated argument, the police are convinced she is just another runaway. When Liz and Margaret's lives collide, Liz sets out to save a child and dispense retribution, even if it means taking the law into her own hands and putting herself in danger to do so.