This book explores C.G. Jung's complex relationship with Friedrich Nietzsche through the lens of the so-called 'visionary' literary tradition. The book connects Jung's experience of the posthumously publishedLiber Novus(The Red Book) with his own (mis)understanding of Nietzsche'sZarathustra, and formulates the hypothesis of Jung consideringZarathustraas Nietzsche'sLiber Novus-- both works being regarded by Jung as 'visionary' experiences. After exploring some 'visionary' authors often compared by Jung to Nietzsche (Goethe, Hölderlin, Spitteler, F. T. Vischer), the book focuses upon Nietzsche and Jung exclusively. It analyses stylistic similarities, as well as explicit references to Nietzsche andZarathustrainLiber Novus, drawing on Jung's annotations in his own copy ofZarathustra. The book then usesLiber Novusas a prism to contextualize and understand Jung's five-year seminar onZarathustra: allthe nuances of Jung's interpretation ofZarathustracan be fully explained, only when compared withLiber Novusand its symbology. One of the main topics of the book concerns the figure of 'Christ' and Nietzsche's and Jung's understandings of the 'death of God.'