is a 1960 French spy thriller film directed by Bernard Borderie and starring Eddie Constantine, Françoise Brion and Alfred Adam.

It is based on the 1945 novel I'll Say She Does by the British writer Peter Cheyney featuring hardboiled FBI agent Lemmy Caution.

[1] It was part of a series of films featuring Constantine as Caution, inspired by the books by Cheyney who had a large French following.

The film's sets were designed by the art director René Moulaert.

Federal agent Lemmy Caution arrives in France to hunt down a spy known as Varley, but finds himself in a rivalry with the French police who are also chasing the same lead.