Rachel urges Oisin to explain his actions to the O'Briens in an attempt to prove he had nothing to do with Katy's disappearance, but as suspicions continue to mount, his excuses may prove to be too little, too late. Meanwhile, when Eoghan learns the Guards questioned Oisin in relation to his daughter's case, Deegan and Alannah warn him not to do anything that might jeopardise their investigation.