A short story by Tamsyn Muir that takes place prior to the events in her The Locked Tomb Trilogy.

"Each of the Empire’s houses keeps secrets, even from themselves. For the bookish academics of the Sixth, every secret is a mystery, and every mystery is a puzzle to be solved or a paper to be published. Deep in the bowels of their house, one such secret is about to reveal itself. The study of the famed academic Donald Sex, sealed since the moment of his death, is about to open, and archivists are ready to dissect what he left behind. They are not ready for the macabre surprise that awaits them.

Enter Palamedes Sextus and Camilla Hect, age thirteen." --source: Tor.com

This <a href="https://www.tor.com/2020/07/29/the-mysterious-study-of-dr-sex-tamsyn-muir/" title="The Mysterious Study of Doctor Sex">ebook</a> is available for free on Tor.com