Mama Grande streaked into Leni's life like a nightmare on wheels. Arriving out of nowhere, she claimed to be the ex-Lone Star detective's grandmother, and spouted dire prophecies of rivers of blood and a world in flames. But her bizarre murder prompts Leni and Combat Biker wannabe Rafael to investigate Mama Grande's past...straight into the dark heart of Aztlan-a lost civilization where human sacrifice is all the rage, and ancient ceremonial games could trigger the end of the world!