Bennett's 2024 fantasy mystery — Sherlock-meets-Bas-Lag. First in a planned trilogy; the best-reviewed SFF novel of 2024.
From Wikipedia
The Tainted Cup is a 2024 fantasy murder mystery novel by Robert Jackson Bennett. It is the first novel in the Shadow of the Leviathan series and was followed by A Drop of Corruption (2025). The novel won the 2025 Hugo Award for Best Novel and the 2025 World Fantasy Award.