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? ⅰⅱⅲ故事講述馬庫斯的妻子在一場悲劇的火車事故中身亡，馬庫斯要趕回家陪女兒瑪蒂爾德。這場事故似乎是一場意外，但一位數學極客 ，也是火車中的一位乘客 ，與他的兩個同事現身 ，說出他們確信這場事故背后另有隱情。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.