Sherlock: The Riddle of the Crown Jewels is an interactive fiction computer game designed by Bob Bates and published by Infocom in 1987. Like most titles Infocom produced, the use of ZIL made it possible to release the game simultaneously for many popular computer platforms, including the Apple II, IBM PC, Atari ST, and Commodore 64. Sherlock is based on the legendary fictional detective Sherlock Holmes, created by Sir Arthur Conan Doyle. It is Infocom's thirty-first game and is the first of two Infocom games developed by Challenge, Inc. using Infocom's development tools.