I gave it 5 and that is generous, considering this film does not achieve many of the goals it sets itself: it is not really suspenseful, the characterization is often vague, the plot is not clear at many points (too many characters don't improve matters). There is a Hollywood gloss over this picture that depresses me; surely a French film can call upon a tradition of thrillers dating back to the post-war years: Le salaire de la peur for example. I thought of Melville of course (Le deuxieme soufflé and Le cercle rouge) and Alain Corneau (Police Python 357). The kids who would troop off to see this one will be quickly bored.
There is little point in trying to single out any of the actors for praise or blame; they seem interchangeable in their roles. Daniel Auteuil looks glum most of the time--did they not pay him enough? Olivier Gourmet from those great Dardenne movies promised much, but his part was clumsily written and not really understandable.