A scientist blames the head of a large company for an ecological disaster in South America. But when a volcano begins to show signs of erupting, they must unite to avoid a disaster.

Sayra, a Native Honduran teenager, hungers for a better life. Her chance for one comes when she is reunited with her long-estranged father, who intends to emigrate to Mexico and then enter the United States. Sayra's life collides with a pair of Indigenous Mexican and Mestizo-Mexican gangmembers who have boarded the same USA-bound train.