#19: Malka Ann Older, The Mimicking of Known Successes (Mossa & Pleiti #1)
This is the first of a soon-to-be series of vaguely steampunk-ish cozy mysteries, which takes place in a space colony that was established in the atmosphere of Jupiter after both Earth and Mars were rendered uninhabitable. The protagonists, Mossa & Pleiti, are future female analogs of Holmes & Watson who were a lesbian couple at university together, now reunited some years later to investigate the case of a scholar's mysterious disappearance.