Janine Lewis, mother of three and pregnant with her fourth child, is promoted to detective chief inspector. Coming home to celebrate, she catches her husband pleasuring the au pair. Newly single, she struggles to balance her demanding new job with a hectic home life. Lewis and her team investigate the murder of a schoolteacher found at his garden allotment, sliced open like a lab rat.

DCI Janine Lewis and her team continue their investigation into the murder of a schoolteacher.