In the not-so-distant future, two sisters must navigate a world that is unraveling due to climate change. Wildfires blot out the sky, coastlines are being washed away by rising seas, and the Great Pacific Garbage Patch has been geo-engineered into an actual island called Blue Mar. When Laurel and Paloma visit their Great-Aunt in El Salvador, they find that things are far worse than in the U.S., so bad that many people are moving to Blue Mar to start a new life. As they search for their identity and their place in the world, Laurel and Paloma must decide whether to go to Blue Mar themselves, or whether to stay, reconnect with their culture, and fight to save the land of their ancestors.