The loss of his diplomatic position, coupled with the establishment of a Marxist government in Chile, led Serrano to take a revived interest in Nazism. He began reading a number of recently published books that purported to identify links between Nazism and occultism. In 1973, his book "El/Ella: Book of Magic Love" was published. After Allende was ousted in a September 1973 coup and a right-wing military regime under Augusto Pinochet took power, Serrano returned to Chile. He nevertheless found that the Pinochet administration was not interested in his neo-Nazi and Esoteric Hitlerist ideas. In 1980, his book "Nos: A Book of the Resurrection" was published, a form of autobiography influenced by Jungian psychology. He also produced a trio of books that came to be known as his "Hitler Trilogy": "El Cordón Dorado: Hitlerismo Esotérico" (1978), "Adolf Hitler, el Ultimo Avatãra" (1984), and "Manú: "Por el hombre que vendra"" (1991).