What is the author's style in The Tears of Autumn by Charles McCarry?

According to publisher information on the book jacket, author Charles McCarry worked as a deep-cover CIA operations officer in Europe, Africa, and Asia during the 1950s and 1960s. Thus, he writes what he knows about personally. He resists any temptation to bury the reader in jargon and even scoffs at how movies and books stereotype spies. The closest he comes is saying that "Lê Thu" (Tears of Autumn) as a code name is poetic but insecure. He explains that it has real-world connotations, which allow it to be broken.