Uncover the hidden world of Vatican espionage through Eric Frattini's groundbreaking investigation into the Holy Alliance and Sodalitium Pianum. From Renaissance-era assassinations to modern counterintelligence, discover how networks of priest-agents shaped European history through covert operations conducted in the name of Catholic supremacy. This meticulously researched account traces the evolution of papal intelligence services across five centuries, revealing how the Vatican wielded both spiritual and temporal power to influence global events. Following the intricate dance between religious authority and political intrigue, Frattini exposes the sophisticated intelligence apparatus that operated behind the Vatican's public face, demonstrating how the intersection of faith and espionage shaped our modern world.