In 1993, a series of violent armed robberies occurred on the K3/4 international train connecting Beijing and Moscow,the only land communication line between China and Europe back then. The Chinese police engaged in a cross-border investigation and vowed to bring the perpetrators to justice. Disguised as businessmen and undaunted by danger, a special operations team led by the Railway Police set off for this investigation in the unfamiliar territory of Moscow, with only one goal in mind: to arrest the criminals and successfully extradite them back to China. The film is based on a real historical event. 1993年,接连中国与欧洲的唯一陆路交通线——K3/4次往返北京莫斯科的国际列车上发生多起持枪暴力抢劫事件,中国警方介入跨国调查,誓要将凶手绳之以法。 铁道公安为首的特战小队深入陌生国度莫斯科,伪装商人深入险境,目标只有一个:逮捕罪犯,并将其成功引渡回国。影片改编自真实历史案件。