«The Adventure of the Dancing Men» by Arthur Conan Doyle

In “The Adventure of the Dancing Men”, a Norfolk country squire from a reputable family hires Holmes to help him learn who has been sending him weird encoded messages, in the form of dancing stick figures, that are disturbing his wife. Upon collecting enough of the messages Holmes cracks the code. He returns to Norfolk to present his findings only to find that his client has met with tragedy. Using forensic science and his inimitable powers of deduction, Holmes, is able to assist the Norfolk authorities and identify the criminal.