Petra Luna is in America, having escaped the Mexican Revolution and the terror of the Federales. Now that they are safe, Petra and her family can begin again, in this country that promises so much. Still, twelve-year-old Petra knows that her abuelita, little sister, and baby brother depend on her to survive. She leads her family from a smallpox-stricken refugee camp on the Texas border to the buzzing city of San Antonio, where they work hard to build a new life. And for the first time ever, Petra has a chance to learn to read and write.

Yet Petra also sees in America attitudes she thought she'd left behind on the other side of the Río Grande—people who look down on her mestizo skin and bare feet, who think someone like her doesn't deserve more from life. Petra wants more. Isn't that what the revolution is about? Her strength and courage will be tested like never before as she fights for herself, her family, and her dreams.