The same day, 300km apart, two policemen are given two very distinct cases. Pierre Niemans (Reno) is a man of experience, who has an infallible instinct in criminal affairs but hides painful fears. He travels to Guernon, a university town in the Alps where a violent murder has taken place.
Max Kerkerian (Cassel), young, sharp and a loner, is a former car thief who entered the police force through a love of danger. He is investigating a desecrated graveyard, and in particular, the grave of a child who disappeared twenty years before.
The two investigations soon crash head on and the murder count begins to grow. The truth will outdo all theories, taking the two policemen to high altitudes, caught between icy heights and death´s door.