Series: Obsidian and Blood #3
In this conclusion to the Obsidian and Blood trilogy, Acatl has to investigate a possible plague after a warrior collapses during the Revered Speaker's return ceremony. Acatl is High Priest of the Dead and the whole trilogy is a historical fantasy based on the Aztec Empire in the 15th century. It's pretty neat, although somewhat bloody (you know the Aztecs and blood sacrifices).
The only bummer was that I found that the text had a higher number of mistakes than I like (a few missing words and typos).