When Lorna Brady wakes to find a corpse in her house, she has no idea who the dead woman is or if she's responsible for the apparent murder; retracing her steps, Lorna realizes that the mysterious woman could be linked to her past.

Lorna still hasn't slept, and she has no intention of doing so until she finds out what Aoife Cassidy knew; the town's laundry survivors are campaigning for justice, and Lorna discovers that Aoife spoke to another survivor.

A survivor's funeral puts Lorna on edge; hope then comes through unexpected information about Clemence's daughter, and this might hold the answer to Lorna's child's own fate; when Lorna finds a new ally, it brings her to a devastating truth.

Lorna uncovers more horrors at the convent; in Dublin, Colman delves into his own past and discovers the source of his nightmares; a new lead cracks open the case.

Lorna and Colman become unusual allies when pursuing the truth; the survivors receive life-changing news; a fresh suspect emerges in the murder case.

Aoife Cassidy's past reveals answers in the present; Colman closes in on his suspects; Lorna tries to find peace.