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.

On the way back to school for the first time after her maternity leave Janine witnesses a hit and run outside her son's school. While wishing to investigate, she is at the same time summoned to view a corpse found in the river.

A public appeal reveals the woman to probably be Rosa Milicz, who worked at Topcat, a lap-dancing club. Meanwhile the little girl involved in the hit-and-run dies.

Richard and Shap go to Topcat where they discover that the manager of the club is James Harper, who coincidentally also owns the hit and run car.

A popular Mullah dies in a house fire and all the evidence points to a local politician. Janine thinks there's more to it, but nobody in the Muslim community will talk to her.

""What first looks like a straightforward suicide case soon turns much more sinister.

At the funeral of the suicide victim, Charlotte Moran, her father, Frank Evans, and her husband, Dave Moran are grieving for her. Meanwhile, behind the scenes at the crematorium, John Wheeler also weeps as he prepares Charlotte's coffin for the cremator, when her husband, Dave, angrily confronts him.

Two weeks later, the crematorium secretary, Mary Hunt, reports that both Dave Moran and John Wheeler have gone missing. Rumour has it that John Wheeler and Charlotte Moran were having an affair.

Janine opens an investigation and forensic tests reveal that another body was cremated with Charlotte. But was it Dave Moran or John Wheeler? Janine tells the team they have a murderer and a victim, but which is which?

When the only witness to a woman's murder is an autistic boy who cannot communicate what he saw, Janine has to get to the truth another way.