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Description: Off-duty policeman Joe Roag (Joe Cole) works with Abby Aysgarth (Alexandra Roach), the acting technical director at the National Cyber Security Centre (NCSC), to find out who has taken control of the train he is taking to London in the thriller series written by Nick Leather. [Premiered originally in the UK on BBC One on 15 Sep 2025 and in the US on BritBox on 26 Dec 2025]