
13 chapters~13K wordsUpdated Jul 13, 2026
The Black Raven Conspiracy
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About
Sherlock Holmes and his best friends, John Watson and Molly Hooper, are enjoying their third year at Hogwarts. After all, there are new classes to be attended and new responsibilities for all of them. But halfway through the spring term Molly's friend Soo Lin Yao starts finding pairs of ancient runes all over the castle. The three friends are soon brought into the world of black-market magical artifact trade, and a group on the trail of a treasure: Rowena Ravenclaw's lost diadem. However, the people searching for the diadem want much more than better marks, and are willing to stop at nothing to find the diadem. Cross-posted from Archive of Our Own (original posting date 2017): https://archiveofourown.org/works/7550890/chapters/17172445. Also cross-posted on fanfiction.net
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