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Sebastien Grenier (Lino Ventura), a former French spy, is working as a financial analyst in Zurich and cultivating an on-going relationship with Anna Gretz (Krystyna Janda), a German teaching at the university. Then his peaceful existence starts to disintegrate when he is recruited by a top French intelligence operative (Michel Piccoli) to discover how one of their own secret agents was found out and executed in broad daylight by a gang of terrorists. Sebastien starts to work but is immediately put off by the fact that his contacts are being murdered before he can reach them. As he gets deeper and deeper into the case, he comes to realize that he is being used in an elaborate political scheme, a scheme that leads to the death of Anna and a vow to get the killers who have now ruined what is left of his life.