Sir James comes to 221B Baker Street in the name of an anonymous but illustrious client. It concerns General de Merville's daughter, Violet, who has fallen for the Baron Adelbert Gruner. The man has a bad reputation and Sir James hopes that if his misbehaviours can be proven by Holmes Violet will agree to break off the union. Just how bad the Baron's actions have been and how to prove it is what Sherlock Holmes will have to find out. "The Adventure of the Illustrious Client" is part of "The Case-Book of Sherlock Holmes".