Detective Holly O'Rourke and her team investigate the gangland-style murder of a suburban mother; Holly is rocked by news that will jeopardise her marriage and career.

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

After learning the mystery hit man 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; 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; Holly's marriage reaches crisis point.

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