In 1953, Serrano—following a number of other family members—joined the Chilean diplomatic corps. He hoped to gain a posting to India, a land which he considered to be a source of great spiritual truths. He was successful in this, and remained in India until 1962. In this period, he visited many Hindu temples and searched for evidence of the secretive Brahmanical order into which F. K. had alleged initiation. In his role as a diplomat, he met various prominent figures, including Jawaharlal Nehru, Indira Gandhi, and the 14th Dalai Lama. It was while in India that he wrote and published two books: "The Visits of the Queen of Sheba" (1960), which had a preface by Jung, and "The Serpent of Paradise" (1963), which discussed his experiences in the country. Serrano had engaged in further correspondence with Jung between 1957 and 1961. In 1965 his book, "C. J. Jung and Hermann Hesse: A Record of Two Friendships", was published.