In 1963, the fierce public controversy surrounding Hannah Arendt's Eichmann in Jerusalem prompted Karl Jaspers to make an attempt on the meaning and limits of independent thought. His initial intention was to back his master student with a brochure. His notes soon branched out, however, so that he became increasingly concerned with the role of the German resistance in the Third Reich and with the person of Eichmann. Ultimately, the fragments from his Marbach estate bear witness to a hitherto little-known concern of his entire philosophizing in the field of tension between metaphysics and political philosophy. Georg Hartmann has now published the "Hannah Book" for the first time as part of the Complete Edition of Karl Jasper's Works. Wolfram Eilenberger, who published Zeit der Zauberer. Das große Jahrzehnt der Philosophie and Feuer der Freiheit. Die Rettung der Philosophie in dunkler Zeit, together with the Hannah Arendt editor, literary scholar and essayist Barbara Hahn, asks what new light Jaspers' notes shed on a theorist whose life's work is posthumously gaining ever greater influence worldwide.