"Lucia Castillo dreams of being a hero like her grandfather. But to the people in their Texas town, he was just a strange old man who dressed up as a knight and claimed to save the world from monsters only he could see. Now years later, when Lucia and her best friend--and trusty squire--Sandro discover the town mayor is secretly a shapeshifting beast of Mexican lore, her parents think she's imagining things like her "Abuelo Loco." Only Lucia, wearing...