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When a night-time firebomb attack at a Brighton travellers' site kills women and children, Chief Superintendent Jo Howe has strong reason to believe the new, dubiously elected, far-right council leader is behind the murders. Against the direct orders of her chief constable, Jo digs deep into the killings secretly briefing the senior investigating officer of her suspicions. As she delves further, Jo uncovers an underworld of human trafficking and euthanasia all leading to a devastating plot which threatens thousands of lives and from which the murderous politician looks sure to walk scot-free. Having narrowly survived a plot to kill her, where another was not so lucky, she realises that only by facing near-certain death once more can she thwart this terrorist outrage.