In "Saint of the Secret Service," Le Queux likely explores the shadowy world of espionage, revealing the clandestine operations of spies and the tactics used by intelligence agencies. The book may feature a protagonist involved in counter-espionage activities, uncovering plots, deciphering codes, and navigating the dangerous world of international spies.Le Queux's writing style typically includes intricate plots, suspenseful twists, and a focus on the geopolitical tensions of his time. "Saint of the Secret Service" would be expected to provide readers with a blend of entertainment and insights into the methods and motives of spies operating in Europe and beyond during the early 20th century.