Widdershins by Jordan L. Hawk

The first book in a series of Whyborne and Griffin is set in the fictional town of Widdershins, MA. The setting is during the time of the Pinkerton's, and is filled with adventure. Dr. Percival Whyborne, a comparative Philologist, is teamed with Griffin Flaherty, a former Pinkerton. The characters are quite dissimilar, but manage to work quite well as they work to solve cases and each other. Featuring more sex than strictly necessary, the story is an enjoyable romp through a time period that was far more difficult to be 'out' in - in fact, unheard of.

I'm on the second book, and it's worth reading.