Ten people—eight children and two counselors—find themselves trapped in a remote mountain lodge in the Pyrenees when a violent snowstorm cuts off all access routes. With no electricity, no water, cut off from the outside world, and rescue growing ever more distant, all they can do is wait… and hold on.
To make sure no one has gone missing amid the chaos, they decide to count themselves: 7… 8… 9… 10… 11. There’s one extra child. No one knows who he is or how he got there. But the counselors decide to take him in for the time being. Still, as the lockdown drags on, the mysterious newcomer becomes more unsettling, aggressive, and enigmatic, sowing doubt and fear among the children. And the shelter ceases to be a safe place. Because no one can leave… but no one can escape either.
