"For fourteen years, Letty Espinosa has worked three jobs around San Francisco to make ends meet while her mother raised her children--Alex, now fifteen, and Luna, six--in their tiny apartment on a forgotten spit of wetlands near the bay. But now Letty's parents are returning to Mexico, and Letty must step up and become a mother for the first time in her life. Navigating this new terrain is challenging for Letty, especially as Luna desperately misses...