On this Christmas morning, Nathalie and Mark wake up very late. While their daughter Alice is still asleep, Mark hurries to the airport to meet his parents who have come to celebrate Christmas with them. Rapidly, a dazzling blizzard rises and gradually interrupts all possibility of car traffic on the surrounding roads, forcing guests to cancel each other successively. Without any news of Mark, Nathalie finds herself alone with Alice. A winter in camera session is then set up, during which the teenager's attitude appears increasingly strange and incoherent.