Le Retour du héros

Charming womanizer Captain Neuville (Jean Dujardin) is called to battle right before he marries the naïve Pauline. When Pauline doesn't hear from Neuville for months, her sister Elizabeth (Mélanie Laurent) begins writing Pauline fake letters from Neuville. To Elizabeth's dismay, he unexpectedly returns and slips into the facade she created, exploiting his newfound war hero status.