Marta and Felix are at the United States/Mexico border trying to capture footage for their documentary about immigrant abuse. While Felix is putting himself in danger by trying to infiltrate the Heroes of the Homeland militia, Marta hears talk about an entity called La Santa de la Frontera that is rumored to protect the vulnerable. There’s something brutal and bloody going on around the border, and this time it’s targeted toward those who attempt to victimize the Mexican people.