The 21st-century age of migration comes into deeper focus in this poetic look at the border between Mexico and its Central American neighbors, the first obstacle between hopeful migrants and their dreams for a better life. For thousands of immigrating Guatemalans, Hondurans, Salvadorans, and others, southern Mexican border towns like Tapachula, Chiapas, are where the dangers of their journey begin: If the police don't get you, the thieves will (and if the thieves don't rob you, the police will).