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Boyd is being moved out of the Cold Case Unit, but first takes on the mystery of 16 homeless boys from Waterloo Bridge who disappeared in the 1980s.
Boyd needs Sarah's counter-terrorism expertise to help expose the state's involvement in Barclay's death, but the case amplifies her self-doubt.
There's growing concern over Sarah's disappearance, and time is running out for Boyd as he fights for justice against a powerful adversary.