The Rahendo & Ryhunzo Mysteries are historical, almost-cozy mysteries, set in the medieval World of Anaxantis.
The main storyline is called Dark Tales of Randamor the Recluse and consists, of seven books, a trilogy, The Invisible Chains, and a quadrilogy, The Invisible Hands.
Although the Rahendo & Ryhunzo Mysteries are parallel to the main series, they are meant to be stand-alone stories. They are also far lighter fare than the Dark Tales.
Rahendo and Ryhunzo, the amateur sleuths, are a gay couple. Some vanilla male on male action occurs.
These links will bring you to the individual book pages, with a synopsis and buying links:
Dagger of Deception, the first Rahendo & Ryhunzo Mystery