Arthur Conan Doyle was a British writer best known for his detective fiction featuring the character Sherlock Holmes. His works also include fantasy and science fiction, as well as plays, romances, non-fiction and historical novels. "The Valley of Fear" is the fourth and final Sherlock Holmes novel. In this tale drawn from the notebooks of Dr. Watson, the deadly hand of Professor Moriarty once more reaches out to commit a vile and ingenious crime.