Critically acclaimed author Emma Otheguy joins Newbery Honor-winning Adam Gidwitz as co-author as the kids travel to Cuba to help the legendary Madre de aguas, now in paperback. In Cuba, it is believed that a mysterious water serpent--the Madre de aguas--is responsible for providing and protecting the fresh water of the island. But the serpent is missing, and a drought has gripped the island. Uchenna, Elliot, and Professor Fauna fly to Cuba and endeavor to rescue the Madre de aguas.