Investigative journalist Lisa Wallace publishes an article about her mother's murder, which sparks the disappearance of Amy Reynolds. Her and Detective David Burkely work together to find Amy. Their investigation takes them around Ireland, as more girls go missing. They follow every lead, but some are dead ends. All the meanwhile, the killer plays psychological torture games with Lisa, putting her in compromising situations. As they get closer to finding the killer, David and Lisa learn more about the long rooted corruption in the Garda system. To cover their tracks, high-ranking garda members blackmail David with his own secrets. The investigative trail finally leads Lisa to the killer, where they face off again after all these years. She must confront her childhood trauma in order to save these missing girls.