Gibson's investigation leads her to the killer's lair, but there is no sign of Rose Stagg and the detective instructs her team to step up the interviews with Katie, Sally Ann and Spector in a desperate attempt to find her. However, it is only when Spector makes a final move to remain in control that Gibson is offered any answers.
Elenco: Gillian Anderson , Jamie Dornan , John Lynch , Michael McElhatton , Niamh McGrady , Stuart Graham , Valene Kane , Emmett Scanlan , Krister Henriksson , Aisling Franciosi , Aidan McArdle , Richard Coyle , Ruth Bradley , Colin Morgan , Aisling Bea , Bronagh Waugh .