Text by Jean Cayrol said Michel Bouquet, a mixture of archival black and white and color footage. It takes its title from the name given to deported to death camps by the Nazis, the NN (Nacht und Nebel), which seemed to forget and want to take their fate. Documentation work serene, calm and determined, this film shows how in turn the sites of concentration camps and that the work of extermination could have a normal rate, how the killing was organized rationally and without emotion in a word, technique, and how the state were kept far from the scene indicate that it once perpetrated.