In a world of knife-edge glaciers a hideous crime leads two maverick detectives to confront the limits of human evil. A corpse is discovered wedged in an isolated crevice. It has been horribly mutilated. The brilliant but violent ex-commando Pierre Niémans is sent from Paris to the French Alps to lead the investigation. Meanwhile, in a town in south-west France, Karim Abdouf, a young Arab policeman, is trying to find out why the tomb of a young child has been desecrated. When a second baby is found, high up in a glacier, the paths of the two policemen are joined in the search for their killers, a trail that embroils them in the mysterious cult of the blood red rivers.