First-time feature filmmaker Tommy Davis grew up in McAllen, a Texas town directly across the Rio Grande from Reynosa, Mexico; for him, illegal immigration always had a human face. In 1995, a U.S. Border Patrol crackdown took a new approach to border security, beefing it up at populated checkpoints and leaving only arduous routes across the mountains and desert relatively unpatrolled. Rather than giving up and staying home, migrants took their chances. Davis' short, sad documentary is narrowly focused: It's not about international politics, geopolitical trends, homeland security or the economic repercussions of undocumented and unregulated labor. It simply chronicles...