The Shadow of the Lords — Simon Levack

Mexico, 1517. The Aztec capital is awash with fear and rumors. A strange figure has been seen running through the streets. A being with the face of a snake, his body covered with glittering green plumage: Quetzalcoatl---the Feathered Serpent. Is it an omen? Or is it the god himself, come to warn of impending disaster?
Yaotl, the chief minister's slave, has more immediate matters to worry about than omens and portents. Engaged in a desperate search for his son, he's on the run from his vengeful master, the all-powerful Lord Feathered-in-Black. If the chief minister catches him, Yaotl can expect a grisly fate.
Attempting to escape his master's bloodthirsty warriors, Yaotl stumbles upon a dismembered, unrecognizable corpse. As he pieces together the clues to who the dead man was and how he died, Yaotl finds himself drawn into an affair of greed, jealousy, and lust among the ancient, secretive society of the feather workers, the Aztecs' foremost craftsmen. And, as he is to discover, the answers to those clues will provide the key to the search for his son.
But before he can solve the mystery, Yaotl will need his wits about him simply to stay alive---for Lord Feathered-in-Black and his henchmen are never far away....