Honoré is a valet blessed with the inability to tell a lie. In addition to his honesty, Honoré is also supremely logical, a character trait that comes in handy for his master, lawyer Maitre (Jean Martinelli). The valet not only saves Maitre's business, but also his marriage. Alas, Honoré's candor and wisdom does good for everyone but himself--until the film's twist ending.
Source : allmovie.com