About the book (from Wikipedia):
The Plumed Serpent is a 1926 political novel by D. H. Lawrence; Lawrence conceived the idea for the novel while visiting Mexico in 1923, and its themes reflect his experiences there. The novel was first published by Martin Secker’s firm in the United Kingdom and Alfred A. Knopf in the United States; an early draft was published as Quetzalcoatl by Black Swan Books in 1995. The novel’s plot concerns Kate Leslie, an Irish tourist who visits Mexico after the Mexican Revolution. She encounters Don Cipriano, a Mexican general who supports a religious movement, the Men of Quetzalcoatl, founded by his friend Don Ramón Carrasco. Within this movement, Cipriano is identified with Huitzilopochtli and Ramón with Quetzalcoatl. Kate eventually agrees to marry Cipriano, while the Men of Quetzalcoatl, with the help of a new President, bring about an end to Christianity in Mexico, replacing it with Quetzalcoatl worship.