This Man Is Dangerous (French: Cet homme est dangereux) is a 1953 French thriller film directed by Jean Sacha and starring Eddie Constantine, Colette Deréal and Grégoire Aslan.

[2] It followed the film La môme vert-de-gris which had been Eddie Constantine's debut as Lemmy Caution and it was also successful at the box office.

Lemmy Caution is assigned to neutralise the international crimininal network of villain Siégella (Grégoire Aslan ) as an undercover agent.

During his covert investigations at the French Riviera he gets to know a beauty named Constance (Colette Deréal) who is associated with Mister Siégella.

Lemmy can convince him that he would help to kidnap the rich American heiress Miranda Van Zelden (Claude Borelli).