“The BBC has released the first pictures of Nightsleeper, its upcoming real-time thriller about the hacking of a sleeper train travelling from Glasgow to London, and a government agency’s frantic efforts to intervene in the rapidly-escalating events onboard. Can two people who’ve never met, one on the train and one not, work together to save the lives of its disparate group of passengers as the Heart of Britain overnight service hurtles towards what might quite literally be its final destination?”