Detective Holly O'Rourke and her team are under pressure to solve the gangland-style murder of a mother. Holly is rocked by news that will threaten her marriage and career.

Holly puts her life in danger when she investigates a rival police officer for murder. Meanwhile, Holly's marriage faces its most severe test.

After learning the mystery hitman shot the wrong woman, Holly and her team race to identify the real target before she is killed.

Holly can now confirm that the first murder was a tragic mistake. The real victim was another mother of young children who lives on the same street and she is still in mortal danger.

Holly has finally managed to figure out the motive for the first murder but her personal life is still in turmoil as she has chosen to let the pregnancy go ahead despite the fact that it could mean the end of her marriage to Luke.