Aoife's body is missing and Lorna is devastated by the news of the death of her child. The search for her daughter's grave becomes ever more fraught. Enlisting Michael to help, the two begin to understand the enormity of what Aoife Cassidy had come to share with the town. Lorna takes matters into her own hands and heads toward the convent, but will she be brave enough to face past demons?

Back in Dublin, Colman is reprimanded for his renegade actions. It feels to him that his nightmares are becoming real, and he begins to delve into his own past. A shocking revelation builds a new connection in the case. Does Colman hold the answer that Lorna is looking for?

We delve into Aoife Cassidy's past, tracing her days in the convent, her peculiar gifts and taking us right to Father Percy's door the night of the murder. But all is not as it seems. 

Colman and Massey work together to capture the true culprit behind Father Percy's murder – but there are darker figures in the shadows who still walk free. 

Lorna is close to understanding how her daughter was hidden, but an abrupt end questions her sanity. Finding Aoife at last brings Lorna the peace that she needs, although Colman doesn't see it that way at all. As a final gesture, Colman brings some good news.