Tiny portraitExtended universe sigil A Study in Emerald is a comic book that was written by Rafael Albuquerque and Neil Gaiman, and published in 2018 by Dark Horse Comics. The protagonist is Sherlock Holmes who is investigating a horrific murder. In a world full of Victorian era characters such as Dr. Jekyll and Professor Mortiarty. It's a world in which the forces of the Mythos rule the powers of Earth as sovereigns (including a tentacled Queen Victoria who has ruled Britain for 700 years, Nyarlathotep in Egypt, and Shub-Niggurath as Emperor of China).

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