The thesis addresses the co-authorship of the editorial designer with the writer in the production of literature books. In this context, the position is adopted that not only the written text tells the story, but the object as a whole. Narrative Editorial Design is the term adopted in this research, to characterize integral editorial projects that build the multisensory non-verbal narrative together with the verbal narrative. In this case, a great involvement of the editorial designer, intellectual effort, creative and technical capacity is required. However, despite being increasingly present in storytelling, the editorial designer is only considered a collaborator. It so happens that there are no parameters to identify the non-verbal narrative of the book within the scope of the Copyright Law, nor legal arguments for the designer to be credited as a co-author and receive royalties from the sale. It is understood that the relationships established throughout the co-authorship project interfere and improve the final product and the articulation of narratives enhances immersion in reading. It is in the interests of editorial design to position itself in the face of emerging scenarios, with legal support, recognition and professional security in the market. Thus, the objective of this thesis is to find and suggest general principles so that the editorial designer can co-author books. The path taken begins with a bibliographic research of theoretical references on authorship in Literature and Design and documentary research on copyright; passing through a work of participant observation, study of exemplary cases, exploratory and directed interviews and personal report; arriving at the descriptive analysis of the results obtained. The general principles presented are not limited to the specificities of Narrative Editorial Design, but they open the way to a possible effectiveness of the co-authorship of the editorial designer with the writer.