The book sets out to analyze the mode in which heterogeneity operates in Patrick Deville's novelistic production. In his textual practice, this contemporary novelist organizes the scene of writing in the form of an intergeneric and intertextual game, mixing materials of all kinds. The absorption of all these resources, to which must be added scientific borrowings, linguistic hybridity and an anarchic management of the textual space, create a new form of writing whose contours remain vague and undecidable. The challenge of such a practice of formlessness or openness is to undermine the norms of the great founding narratives and to open up the novels to release unsuspected potentialities.