自由泳教学五个步骤

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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。。A widow invites a number of guests to stay at her mansion. She reveals that she knows that one of the group killed her husband. Soon they too are being murdered one by one.。