In 2067, train vendor Chen Haonan unexpectedly awakened a deduction system aboard an international train bound overseas, granting him the ability to foresee the future. He discovered that a gang of wanted criminals led by Ke Bo had already sneaked onto the train, targeting Dr. Chen, who was carrying top-secret state documents. Using deductions to correct mistakes trial after trial, Chen Haonan teamed up with conductor Wang An, doctor Liu Feifei, special forces soldier Gao Kang, and others to match wits and courage with armed gangsters on the sealed train. Having weathered numerous crises such as deduction cooldowns, identity exposures, and alienations and feuds, he finally ferreted out the mastermind Lin Fang, who had been lying low for three years, and cooperated with the special forces to wipe out the criminal gang in one net, safeguarding national secrets.