The successful novelist Judith Ralitzer is interrogated in the police station about the disappearance of her ghost-writer. A serial-killer escapes from a prison in Paris. A missing school teacher leaves his wife and children. In the road, the annoying and stressed hairdresser Hughette is left in a gas station by her fiancé Paul while driving to the poor farm of her family in the country. A mysterious man offers a ride to her and she invites him to assume the identity of Paul during 24 hours to not disappoint her mother. Who might be the unknown man and what is real and what is fiction?
| Actor | Role |
|---|---|
 Dominique PinonPierre Laclos / Louis | Pierre Laclos / Louis |
 Fanny ArdantJudith Ralitzer | Judith Ralitzer |
 Audrey DanaHuguette | Huguette |
 Michèle BernierFlorence | Florence |
 Myriam BoyerLa mère d'Huguette | La mère d'Huguette |
 Zinedine Soualemle commissaire | le commissaire |
 Boris Ventura-DiazAlain | Alain |
 Marc RioufolLe propriétaire du vignoble | Le propriétaire du vignoble |
 Thomas Le DouarecNot listed | Not listed |
| SShaya Lelouchla fille d'Huguette | la fille d'Huguette |
 Cyrille EldinPaul | Paul |
 Gilles Lemairele capitaine du bateau « Roman de gare » | le capitaine du bateau « Roman de gare » |
 Serge Moatilui-même | lui-même |
 William Leymergiela voix de la radio Autoroute info | la voix de la radio Autoroute info |
| MMarine RoyerPatricia | Patricia |
| RRebecca BlancNot listed | Not listed |
 Eric DelcourtNot listed | Not listed |
| EEve BitounNot listed | Not listed |
 Jérôme CachonNot listed | Not listed |
| VVictoire DebréNot listed | Not listed |