In this singular book, Enric Corbera guides us through the dark side of human nature. The text begins with a vibrant and lucid conversation with the devil, where, with his help, the author delves into the origin of evil, wars, and human misery, as well as the nature and meaning of our earthly experience. Little by little, the devil reveals himself as the architect of the shadow, though not its originator, since its source lies solely in the human capacity for choice. This process of inquiry leads the author to an encounter with the "other self," those repressed or forgotten aspects of ourselves that we have kept out of our conscious awareness and that await recognition. Only through this reconciliation will we achieve wholeness by integrating our true power. Here, the author delves into the depths of collective myths, dark figures, and taboo subjects that have produced fear and rejection for centuries, pointing to a task we still have to undertake as a culture and civilization. Only by doing so will we be able to heal our inner division and find the ultimate light.