Acclaimed director Charlie Minn closely examines three separate killings along the USA-Mexico border. Three Mexican nationals, all teenagers, had their lives taken by US border agents. Was it murder? Was it self-defense? Minn visits the border in Tijuana, Nogales, and Juarez to shed light on a larger picture of historic violence between Mexican nationals and US border officers, an issue that partially motivates why Donald Trump wants to build a wall there.