Good stuff, as long as you are okay with buckets of spilled blood. Magic costs blood, which leads to a lot of nicked fingers and earlobes, but also several scenes where Acatl roots through the temple livestock reserves for cute-and-fluffy mana supplies. (Routine human sacrifice, as in the let's-keep-the-sun-rising trope, is not erased from the setting, but it's way in the background. Not sure how I feel about that.) I have some problems with the pacing, but they're minor.
(Also, between this and the werewolf book, I am completely full up on books full of foreign names that I can neither pronounce nor remember.)