该剧设定在一辆格拉斯哥到伦敦的卧铺火车上，火车上发生危机并迅速升级，两位陌生人必须合作拯救车上的乘客。
Train between Glasgow and London crosses U.K. escalates while a government agency tries to intervene. Two people who've never met, work together to save the lives of passengers as the Heart of Britain service hurtles towards destination.
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