After a strange car accident, Arthur falls into a coma for a few hours. As he awakes, his delirious speech of incoherent sentences comes straight from the roots of his unconscious. He has to face an odd enigma; what was he doing on this road by night, near Cherbourg ? His worrying, disturbing and liberating sentences have been written down in a black notebook by Alice, a nurse of the hospital' An amazing experience is starting for Arthur; he will be the victim, the guilty one and the investigator' of his own life. Overwhelmed by the trauma of our unconscious, shall we nevertheless sweep away the memories that are a burden onto us ?