Nathan Garrideb comes to Sherlock Holmes, asking for help to find someone with the same surname as him. If he can find such a person, Nathan can touch a $5 million inheritance. He has himself been tracked down by an American Garrideb from Kansas. The latter says they need to be three people of the same name to be able to touch the total amount of $15 million. The case seems most curious to Holmes, who decides to look further into it. 'The Adventure of the Three Garridebs' is part of 'The Case-Book of Sherlock Holmes'.