Ailing athlete Marie (Eline Kuppens) feels as if she's found the perfect place to recuperate when she moves in with a new boyfriend (Matthias Schoenaerts) and takes up residence in the idyllic Left Bank. But a shocking discovery in the basement sends her spiraling into doubt and insanity. Suddenly, she can't be sure whether her lover can be trusted -- and she's seeing things that can't otherwise be explained.