Sébastien, a conscientious and professional train inspector, dreams of being transferred to the South of France. To validate his transfer, he has to make one last routine run under the supervision of Madeleine, a slightly sociopathic inspector who won't let him go. That's when everything goes wrong: between a driver who thinks he's driving a fighter jet, a jealous colleague and passengers who are each crazier than the last, what was supposed to be a formality turns into the worst trip of his life.

Jean-Claude is a loud-mouthed, know-it-all and full time boor who is best friends with Stef, a self-styled lady killer who would do better with the fairer sex if he could work up the ambition to wake up in the morning. Stef has decided that he may need some help in finding the woman of his dreams, and embracing loyalty rather than logic he turns to Jean-Claude for advice.