A train is taken over by cyber terrorists on a night-time journey from Glasgow to London, leaving an off-duty cop on board to team up with the acting technical director at the National Cyber Security Centre in a bid to beat the bad guys. But with no idea of who they are fighting and a few other passengers who may not be as innocent as they look, it seems they are in for a long night.
Nightsleeper S1E1 Screenshot
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