Gabriel and the team are dealing with the fact that another body has been discovered, seemingly the work of the acid attack serial killer. While questions are raised about Gabriel's suitability to be leading this case, the rest of his team have to step up to the plate and continue the investigation when he is called away on a personal mission that strikes straight to the heart of his family. Gabriel's struggle to balance his personal relationships with the women in his life threatens to jeopardise the safety of his daughter as he finds himself faced with a father's worst nightmare. Meanwhile, another suspect in the serial killer case emerges, but when the truth of the brutal murder is finally revealed, it is more shocking than anyone could have imagined.