In the dead of the night, in the heart of a forest: a car. Inside, inhaling carbon monoxide, a man awakens. He finds himself surrounded by three other men, apparently dead. It's the image of a perfect collective suicide. But they're all in chains. He struggles desperately until he manages to turn off the engine. Little by little, his mysterious companions come to their senses. They don't know one another and nobody understands how they got there. They try to piece it all together, their last memories, the previous hours. And soon enough, conflict and mistrust rise to the surface. Nothing is as it seems.
