Ambrose Lavendale, Diplomat is an episodic World War I novel written by E. Phillips Oppenheim that was first published as a serial in 1916, before the United States had joined the conflict, and then as a book in 1920. The plot of the novel revolves around World War One, Mr. Ambrose Lavendale, a young English-American ambassador, quits the embassy to act as a secret agent in London. He runs into Mlle. The French employee Suzanne de Frayne is observing...