When Mextli awakens again for the first time in centuries, the moon is missing from the sky and demons are terrorizing a small southwestern town. He doesn't remember who he is, but the boy Timacoz is convinced he's the Aztec god Huitzilopochtli, returned to save them all from the sorceress who controls the demons and holds the moon hostage.

Mextli agrees to help, but it may be more than he can handle, especially when the voice in his head keeps telling him to kill Timacoz and eat his heart....