ept. Supt. Boyd and his team investigate a 1983 murder when a woman, Lore Carson, saves a man who has fallen on the train tracks and her DNA is matched to that at the old murder scene. The victim remains unidentified as her remains were burned beyond recognition and though her DNA remains intact, they haven't located a match. She was shot through the back of the head however. The evidence would indicate that the woman from the train station may have been chained and held against her will in a cargo container. When the police release her photo asking for anyone to identify her, she panics and tries to flee with her two daughters to her native France. Boyd suspects prostitution in the death but forensic evidence sends them off in a completely different situation. Meanwhile, Boyd appears quite shaken when DNA in another case leads him to someone from his past.

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