John XXIII: The Pope from the Fields is a book by Francis Xavier Murphy, focusing on the life and papacy of Angelo Giuseppe Roncalli, who became Pope John XXIII. He was known as 'The Pope from the Fields' due to his humble origins as the son of a peasant farmer. The book likely explores how his upbringing influenced his papacy, which was marked by a focus on Christian unity, world peace, and initiating the Second Vatican Council.