Another of the Sugiwara Akitada mystery novels is available for free! It may not be free for long, so better grab it while it is. (And no, I am not the author of these books, nor am I associated with her. I just like free ebooks and the Heian era.)
Summary from Amazon: Sugawara Akitada, senior secretary in the Ministry of Justice, is having a bad couple of days. A series of fires is devastating the capital city of Heian-Kyo. On the personal and professional front, some nasty, behind-the-scenes political machinations cause Akitada to be demoted to junior secretary, and an incompetent crawler to be installed in his place. Then, after Akitada goes to the home of the man who orchestrated his demotion, the man is murdered, and, wouldn’t you know it, Akitada is accused of the crime. He knows he has the ability to prove his innocence, but he’s wading into very dangerous waters, and there’s a good chance he might not emerged unscathed.