After investigative journalist Lisa Wallace publishes an article about her mother's murder, girls start to disappear; she and Det. David Burkely investigate across Ireland, searching for the missing girls, while the killer taunts Lisa.

Lisa's article criticizing the Gardaí for not acting on Amy's disappearance is leaked; David and Det. Brennan chase a lead in Castlemoy; impatient with the police's pace, Lisa risks her life to uncover what that lead is hiding.