Jake and Kate argue over the morality of prosecuting a mentally ill man like Tyler and indeed over most things but declare a truce over a broken coffee machine whilst Ronnie catches up with estranged daughter Emma. As the last person to apparently have seen Tyler alive Sam is suspended from duty pending a full investigation. He has a day out with his little boy, to his ex-wife's disapproval. Convinced of Sam's innocence Ronnie does some sleuthing of his own, discovering that CCTV footage of Tyler in his cell has gone missing. This in turn leads him to discover a pact made by the bereaved relatives of the train victims and to the real killer.
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