Emily Coates is an experienced and talented detective in the Met police. After committing a serious crime, where a young boy is left in a coma, she tries to cover it up. When a witness comes forward with evidence of her crime and begins to blackmail her, a destructive relationship develops and she has to decide whether to put up with it or take the only other option open to her. To kill him. But an experienced Scotland Yard detective is on her trail...