Caua̳ and InaÒe are a brother and sister who live in a small community along the TapajÔos River in Brazil. Here, the homes are on stilts and everyone travels around by boat--even to school! When the rainy season comes, they must leave their village and relocate to higher ground for a while. But after moving this year, Caua̳ and InaÒe realize they've left behind something important: their pet tortoise, Titi! Unlike turtles, tortoises can't swim, and Caua̳ and InaÒe are really worried. So the pair sneaks back at night on a journey along the river to rescue him. Will they be able to save Titi?