"Earthly Powers" is a sprawling, complex novel that explores the intertwined lives of a homosexual British writer and an Italian-American Cardinal over the course of the 20th century. The narrative delves into themes of faith, homosexuality, and the nature of evil, while also providing a critique of modern society. It's a vivid tapestry of historical events, including two World Wars and Vatican II, providing a backdrop for the personal and spiritual struggles of its protagonists.

This novel, set in the mid-16th century, transports readers to the vibrant and tumultuous landscapes of Malta, Scotland, and France, following the adventures of a charismatic young nobleman. As part of a series, it intricately weaves political intrigue, historical events, and personal vendettas into a rich tapestry of storytelling. The protagonist, skilled in both intellect and combat, finds himself embroiled in the defense of Malta against the Ottoman Empire, while also navigating the treacherous waters of European nobility's power struggles. The narrative is celebrated for its detailed historical research, complex character development, and the masterful depiction of the chivalric order's role in shaping Europe's destiny.