After a tragedy, Angelo, an idealistic cop throws himself into the troubled life of his new neighborhood of Château Rouge, Paris. But one case, for which he will sacrifice everything, obsesses him more than the rest.
A couple runs over a cyclist with their car, but a hitchhiker appears before they can get rid of the lifeless body. They allow the hitchhiker to join them, not knowing what he saw. Doubts overtake them. Playing on the ambiguity of the situation, the hitchhiker will not let the couple come out of this intact.
