Trini's daughter is sad that her best friend is leaving Saint Michael School since her mother can't keep paying for it. Trini promises her daughter that this won't happen and decides to put together a plan with the other "mamis" of the group to solve the problem. But this mission will be much more difficult than they thought and they will have to stick together as a group.
Sayen follows a lead to the picturesque desolation of the Atacama Desert. There, she reluctantly teams up with a young Atacameño girl, Quimal, looking to clear her father’s name and save her town from becoming an arid wasteland due to Acteon’s exploitative water usage.
