A spiraling descent into fear which begins on a quietly ominous note as family man Michel sets out for his summer home in the countryside with his wife Claire and their three screaming infant daughters. A blistering heatwave and the increasingly cranky children force the family to make a pitstop. In the rest area, Michel bumps into Harry, an old school classmate he doesn't remember, but who seems to remember Michel fondly. Harry, so impressed with Michel when they were younger, even recites from memory a poem Michel wrote as a teenager. Soon, Harry and his voluptuous fiancee, Plum, are joining Michel's family on their vacation. Harry seems to be just what the family needs--his carefree spirit and charm light up Michel's mundane little holiday, allowing him to let go. Yet the friendlier Harry gets and the more generosity and advice he bestows on Michel, the more mysteriously menacing his effects become.