In this paper, we approach the book Tanatografia da mãe, by Isadora Fóes Krieger, reflecting on its themes and aesthetic options, in addition to situating it in the theoretical examination of the fields to which it relates, namely: poetry and essay, thanatography and biographematics. We also aim to place it in the discussion linked to authorship and the poetic voice, in its tension, seeking to understand the impacts of the theme -- death and the mother -- and the personal perspective in the creation of its language.