Je sais rien, mais je dirai tout (1973)
Directed by Pierre Richard

Film Synopsis

Pierre Gastié-Leroy is a 30-something idealist who is far from happy with being the son of an incredibly rich arms manufacturer.  Afflicted with an unwavering desire to help others less fortunate than himself, Pierre turns his back on his military-obsessed family and devotes himself to his true calling as a social worker.  Presently, he is preoccupied with three juvenile delinquents, Luis, Georges and Didier, but this troublesome trio repays Pierre's kindness by getting him arrested in the course of a botched robbery.  Pierre now finds he has no choice but to accept a post at his father's armaments factory.

Incapable of settling any disputes with his father's employees, Pierre soon makes himself unpopular, but along the way he discovers love, in the form of the factory's attractive nurse, Danou.  So desperate is Pierre to escape from his present predicament that he offers jobs to his old friends Luis, Georges and Didier, with the intention of getting them to wreck the factory.  Far from driving Pierre's father to ruin, the three enterprising delinquents appear determined to make him even richer, by doing all they can to improve productivity and frustrate union activities.  They then show their initiative by stealing five hundred tanks and trying to sell them on the black market.  Gastié-Leroy Senior finally gets his comeuppance during a demonstration of a new radio-controlled rocket, arranged for the benefit of the Defence Minister.  What goes up must come down, but not always where you would like it to...