The Case-Book of Sherlock Holmes sees Sherlock Holmes solving some of the most puzzling cases again. His friend and biographer, Dr. Watson, chronicles how Holmes uses his extraordinary intellectual faculties and practiced power of observation to find out facts that appear trivial to most people. In Sherlock Holmes’s method of work, the most basic and mundane facts become the most damning of clues. His talent allows him to become the effective consulting detective who turns the pedestrian into extraordinary.