Sam and Rebecca Hickey are leading an idyllic life in their custom-built house in the West Country, but their paradise is shattered one night when two teenagers break into their home. In a paranoid rage, Sam kills one of the intruders, and the couple stage the scene to make it look like self-defence.

Duplicitous Sam is falling apart, not least over what to do about Angela. Meanwhile, Bailey makes a breakthrough - but hits a wall when she tries to escalate her findings. Rebecca remembers a trauma from her past that gives her the inner strength to take matters into her own hands.