Detective Holly O'Rourke and her team are under pressure to solve the gangland-style murder of a suburban mother. Meanwhile, 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 and her team plan a sting to catch a murderer. Meanwhile, the target of a gangland hit takes matters into her own hands.

Holly's team of detectives uncover a web of organised crime including drugs, money laundering and murder. Meanwhile Holly's marriage reaches crisis point.

Season finale. Holly and her team race to catch the gangland mastermind after Gabe makes a shock discovery.