Daniel Valerio is a writer and wishes to tackle the theme of the psychic pathology for his next novel: NABIS. But this same novel has brought him himself gradually on the path of psychic illness. By dint of research without answers to this disease, he becomes aggressive and forgets to his family, obsessed that he is by his manuscript. One day, his wife Nathalie decides to leave with his daughter, Nina, while Daniel begins to believe in the existence of the characters he has created ...