Lisa Wallace is an investigative journalist who publishes an article about her mother's murder, which sparks the disappearance of Amy Reynolds. Lisa works alongside Detective David Burkely to find Amy, traveling across Ireland as more girls go missing.

As they follow leads, the killer plays psychological torture games with Lisa, putting her in compromising situations. As they get closer to a suspect, David and Lisa learn more about the long-rooted corruption in the Gardaí system. To cover their tracks, high-ranking Gardaí members blackmail David with his own secrets.