A homeless street musician meets an attractive woman by chance and keeps following her until he persuades her to let him stay in her place.

Sylvain Berg, a "professional" unemployed who spends his time hiking and mountain climbing, and "model" bank employee Benoît Constant, who has just been fired and does not want his wife to find out, both find themselves in Françoise Duru's office at an employment agency. Françoise is secretly in love with Sylvain, so in order to keep him close she convinces her employer to give Sylvain a job he doesn't want, instead of Benoit who not only wants it but also has the right qualifications.

The whole intrigue is centered around carte-blanche documents kept in a vault. Whoever fills in the blank becomes the owner of a revue. Big money is involved. The nephew of the owner of the vault is trying to cheat his uncle and have his name in the documents. Everything is even more complicated because the manager of the bank has a finger in the pie, too. Who but a humble bank-teller (Pierre Richard) will ruin the scheme?