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? ⅰⅱⅲ故事講述馬庫(kù)斯的妻子在一場(chǎng)悲劇的火車事故中身亡
，馬庫(kù)斯要趕回家陪女兒瑪?shù)贍柕? 。這場(chǎng)事故似乎是一場(chǎng)意外，但一位數(shù)學(xué)極客，也是火車中的一位乘客，與他的兩個(gè)同事現(xiàn)身
 ，說出他們確信這場(chǎng)事故背后另有隱情。Markus, who has to go home to his teenage daughter, Mathilde, when his wife dies in a tragic train accident. It seems like an accident until a mathematics geek, who was also a fellow passenger on the train, and his two colleagues show up.