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Martin Terrier (Alain Delon) has a problem. He wants to quit his job, but unlike everyone else, he cannot do it because he is a hired hitman and his employers would hate to see him turned out to pasture -- he knows too much, and he is still useful. When he escapes to the countryside for awhile, he meets Claire (Catherine Deneuve), and love blossoms. Back in Paris to confront his employers once again, Terrier gets an ultimatum -- do one last job for them and he can go free. He has no choice but to accept, even knowing that the odds on a long retirement have just changed for the worse.