When Katy Devlin, a 12-year-old girl from a Dublin suburb is found murdered at a local archeological dig, Det. Rob Ryan and his partner, Cassie Maddox, must probe deep into the victim's troubled family history. There are chilling similarities between the Devlin murder and the disappearance 20 years before of two children from the same neighborhood who were Ryan's best friends. Only Maddox knows Ryan was involved in the 1984 case.