Pulga has his dreams. Chico has his grief. Pequena has her pride. Crossing from Guatemala through Mexico, they follow the route of La Bestia, the perilous train system that might deliver them to a better life if they are lucky enough to survive the journey. With nothing but the bags on their backs and desperation drumming through their hearts, Pulga, Chico, and Pequena know there is no turning back, despite the unknown that awaits them. And the darkness that seems to follow wherever they go.