This book takes as its starting-point the chapter called 'On the Blissful Islands' in Part Two of Nietzsche's Thus Spoke Zarathustra, and its enigmatic conclusion: 'The beauty of the Superman came to me as a shadow'. From this remarkable and powerful passage, it disengages the Nietzschean idea of the Superman and the Jungian notion of the shadow, moving these concepts into a new, interdisciplinary direction.