Cristina Henriquez talks about her novel The Book of Unknown Americans, about a boy and a girl who fall in love, and two families whose hopes collide with destiny. Arturo and Alma Rivera have lived their whole lives in Mexico. One day, their 15-year-old daughter, Maribel, is terribly injured, and they doubt that she’ll ever be the same. And so, leaving all they have behind, the Riveras come to America with a single dream: that in this country of great opportunity and resources, Maribel can get better.