The true story of a teacher who set out to make a difference in a border Mexican town, rife with corruption, violence and poverty. Sergio is a new teacher at an elementary school in Matamoros that churns out the worst grades in Mexico. For the kids, it’s a dead end. Sergio decides to turn the tables (literally) and set his pupils problem-solving challenges that stimulate and engage them. His new approach to learning doesn’t find favour with the authorities…