My, oh Maya Mimi, Papa, Christina, and Grant really get in over "skulls" in this Mexican hat dance of a mystery set in the Yucatan Peninsula. When they go to explore ancient Maya ruins, "number" clues seem to abound But what is someone trying to lead them to or wary from? Snakes human hearts a wall of skulls human sacrifice? How creepy can you get, the kids wonder. But in searching for clues, they encounter the wonder that is Mexico and find themselves laughing at things they never thought could be funny all along the way This mystery incorporates history, geography, culture and cliffhanger chapters that keep kids begging for more This mystery includes SAT words, educational facts, fun and humor, Built-in book club and activities. This Carole Marsh Mystery also has an Accelerated Reader quiz, a Lexile Measures, a Fountas & Pinnell guided reading level and a Developmental Reading Assessment level.