The Adventure of the Three Garridebs

"The Adventure of the Three Garridebs" (1924), one of the 56 Sherlock Holmes short stories written by British author Sir Arthur Conan Doyle, is one of 12 stories in the cycle collected as The Case-Book of Sherlock Holmes.
According to Dr. Watson's opening narration, this story is set at "the latter end of June, 1902 ... the same month that Holmes refused a knighthood for services which may perhaps some day be described." This is a parallel to the knighthood of Arthur Conan Doyle around the same time.
Holmes receives a letter from a Nathan Garrideb of 136 Little Ryder Street, asking for help in a most peculiar quest. He is looking for another man with his unusual surname, for it will mean a $5 million inheritance for him. He has been approached by another man, John Garrideb of Kansas, who says that he needs to find others with the same last name.