1994: When Gardas Julia Harte and Adrian Clancy are called out to a sleepy housing estate in Cork to investigate a noise complaint, they are entirely unprepared for what they find. What happens next will haunt Julia for the rest of her career, leaving her plagued with nightmares and terrified of the dark. There is a serial killer at work in Cork, one as clever as he is deadly. Julia may not be a detective yet, but after the harrowing events of that night, she is determined to be the one to catch him...

2024: Julia Harte has chosen just the right place to disappear. Now retired, with an illustrious career behind her, she has moved to a tiny cottage in a remote part of Ireland, where she hopes to find peace. But then she receives a phone call from her old superintendent--two women have been murdered, their bodies marked and staged, just like in '94.

It's happening again. Only this time, the stakes are even higher. Julia must return to Cork to face a vicious killer and the memories that haunt her. Yet Julia is no longer a naive junior officer but a seasoned, tough professional who proves more than a match for any murderer...