In the heartland of Mexico, a close-knit community is grieving the loss of three girls who all died of leukemia within a year. Suspecting that the town’s drinking water may lie at the center of these tragic events, Elia, a local kindergarten teacher, and Nely, a mother who nearly lost her newborn, form a group seeking an investigation into the water supply, but are met with resistance from government officials. With the assistance of Dr. Adrián Ortega, a hydrogeologist from the National University of Mexico, they conduct rigorous testing of the town’s water. Their efforts lead to significant revelations about the dangers hidden within Mexico’s ancient aquifers.