Eliza comes from a well-off family, but that didn't protect them from the flood waters and they have been forced to move in with other family while their house is rebuilt. Meanwhile, the flooding of her school means that she will now be taking classes at a neighboring high school, where the students are traditionally disadvantaged.
Eliza, who has been concerned with climate change for some time, sees Harvey are a warning that she must work harder to reverse the damage, knowing that it may be too late. She decides to take action and puts together a club to educate her fellow students and promote more sustainable practices at school.
Javier was much luckier. There wasn't any damage at his place, which is good since his family would never have been able to afford to rebuild, but the hurricane still has left its mark. Whenever it rains now, Javier gets frightened and curls up into a ball. He's falling apart but doesn't understand why. Into his world (and his high school) comes Eliza and her club seems the perfect antidote for what is causing his fears. It doesn't hurt that he finds Eliza inspiring and attractive.
While the club's efforts promise lots of positive changes, Eliza becomes frustrated at her inability to speed up the changes that she knows the world needs. She loses her perspective, causing her to commit a terrible error that could well ruin both of their lives and derail their goals.
While at times preachy, the story is an entertaining and engaging young teen book about climate change anxiety. It also takes on classism and racism, but not in any particularly new way. For me, the most notable thing was the effort that Mathieu put in to showing adults struggling with the aftermath of the hurricane as well. The teachers, in particular, were much more fleshed out as people than they commonly are (naturally enough, as the author is a school teacher). This carried over to a really nice depiction of the troubled relationship between Eliza and her Dad. It wasn't so much that the adults were the subject, but it was nice to give them a little depth and show that it wasn't only the kids who were hurt.