The Bouvier-Sauvages, a large aristocratic family, meet the much more modest Martin family when their children's wedding is announced. For the occasion, the future bride and groom offer their parents DNA tests, which will reveal their true origins. The results are totally unexpected and will make the effect of a bomb.

Anna's lifeless body is abandoned on a road in the middle of a forest. Like the name of the main character, this narrative and visual palindrome tells us how this young woman from a wealthy family met such a tragic fate.