Somewhere in the city of Cork, a woman's cry echoes through the rainy streets.

On a bloodstained mattress in a grimy flat, a burly man lies dead. A terrified girl kneels over his body. She has been trapped here for three days. It doesn't take DS Katie Maguire long to identify the murder victim: he's a cruel and powerful pimp she's been trying to convict for years.

It's Katie's job to catch the killer. But with men like this dead, the city is safer – and so are the frightened young women who are trafficked into Cork. When a second pimp is horrifically murdered, Katie must decide. Should she do her job, or follow her conscience? Should she allow the killer to strike again?