Sherlock Holmes has not only captivated readers for more than a century and a quarter, he has fascinated writers as well. Almost immediately, the detective’s genius, mastery, and heroism became the standard by which other creators measured their creations, and the friendship between Holmes and Dr. Watson served as a brilliant model for those who followed Doyle. Not only did the Holmes tales influence the mystery genre but also tales of science-fiction, adventure, and the supernatural.