Inspired by real events, 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.