There are 3 books in the Obsidian and Blood series. The newest book is Master of the House of Darts which came out in 2011.

1
Servant of the Underworld

Book cover of Servant of the Underworld
The first book in the critically acclaimed Obsidian and Blood trilogy:

Year One-Knife, Tenochtitlan the capital of the Aztecs. Human sacrifice and the magic of the living blood are the only things keeping the sun in the sky and the earth fertile.

A Priestess disappears from an empty room drenched…
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2
Harbinger of the Storm

Book cover of Harbinger of the Storm
It is Year Two-House - and the Mexica Empire is in chaos Flesh-eating demons roam the land, and rumours persist of a return of their creator, a malevolent goddess. The council needs to choose a new Emperor to unite them all, but when a councillor is murdered only Acatl, High…

3
Master of the House of Darts

Book cover of Master of the House of Darts
The year is Three Rabbit, and the storm is coming...The coronation war for the new Emperor has just ended in a failure, the armies retreating with a mere forty prisoners of war - not near enough sacrifices to ensure the favour of the gods. When one of those prisoners of…