故事讲述马库斯的妻子在一场悲剧的火车事故中身亡,马库斯要赶回家陪女儿玛蒂尔德。这场事故似乎是一场意外,但一位数学极客,也是火车中的一位乘客,与他的两个同事现身,说出他们确信这场事故背后另有隐情。Markus, a deployed military man, has to go home to his teenage daughter, Mathilde, when his wife dies in a tragic train accident. It seems to be plain bad luck - but it turns out that it might have been a carefully orchestrated assassination, which his wife ended up being a random casualty of.