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While the team looks into the murder of a Portuguese au pair who was recently fired from her job, Vivienne and Rob start investigating David on the sly, but he remains a step ahead of them.
When an eight-year-old boy finds his grandfather dead in a pub basement, he tells Rob that he was hit by a man with a baseball bat, but Vivienne doubts his story. Later, Vivienne pressures Rob to report that he covered for David on the night of Sarah's disappearance.
When a father and son are shot execution-style in broad daylight, the detectives immediately suspect a gangland hit and worry the violence could escalate. David sees an opportunity to finally apprehend crime kingpin Adrian Cook.
The elite murder squad returns. As the detectives solve each case - skeletal remains dug up in the garden, the brutal murder of a pub landlord, a teenage au pair found dead in a very compromising position, the double-shooting of a father and son - there's one mystery Detective Inspector David Bradford can't unravel - where is his wife Sarah? As the other detectives investigate why David is lying to them about the night Sarah disappeared, they begin to think the unthinkable - did the Detective Inspector murder his wife?