Marceau Léonetti, a competent and energetic officer stops by chance the son of an influential lawyer driving under the influence of alcohol. A few months later, the lawyer falsely accuses Léonetti as being violent and incompetent. As a result Marceau is transferred to a small police station, where he meets young and beautiful Jeanne. Soon they are faced with a tough investigation.

David learns that his mother has cancer and only two months to live. He decides not to let her know.

A small saver discovers the scam that threatens all subscribers to the "Caution foncière". He embarks on an incredible adventure to recover the funds paid in by his friends, and succeeds in exposing the scandal.