六人在马赛乘坐火车到巴黎。 到达后，却发明一位妇女死于车上。 警方随即查询拜访了别的五名乘客，并思疑其中一人是凶手，但嫌疑犯一一离奇死亡。 最初两个幸存者必需在本人成为下一个受害者之前靠本人查询拜访清晰。

A Parisian museum director believes his wife has lost interest in him and so places a poisoned cigarette in the box on his desk - thus allowing chance to decide the moment of his death.