Having not had time to recover from the previous case, Lieutenant of the Paris Department of the Gendarmerie Ludivin Vanker plunges headlong into a new investigation. The body of a man was found on the railway tracks, missing legs and the top of his head. All attempts to detect the killer's DNA on the victim's body turn out to be a failure - someone thoroughly washed the unfortunate man in bleach before putting him on the rails. The investigation becomes even more confusing when it turns out that the murdered man converted to radical Islam several years ago. Strange murders continue. Some of them bear the signature of a bloodthirsty maniac, others are similar to a religious ritual. It seems that evil has a new guise. This time, Ludivine, together with his comrades, including those from the counterintelligence agencies, will have to enter into an unequal battle with an organization whose methods are as terrifying as they are merciless.