Judith Werner examines how anti-Semitism manifests in a core area of Heidegger's thought: his understanding of poetry and literature. Her analysis of the Black Notebooks published in 2014/15, which triggered a veritable earthquake in Heidegger research and in the cultural sections of the German and international press, contextualizes the origins and expressions of anti-Semitic ideology in Heidegger's thought from a literary and philosophical historical perspective. The critical study calls on the research community to engage in an honest debate that neither denies nor philosophically idealizes Heidegger's anti-Semitism.