After her widowed father dies, deaf teenager Dot moves in with her godparents, Olivia and Paul Deer. The Deers' daughter, Nina, is openly hostile to Dot, but that does not prevent her from telling her secrets to her silent stepsister, including the fact that she wants to kill her lecherous father.

Set more than a decade after the events of the first film, learn the story of the Sully family (Jake, Neytiri, and their kids), the trouble that follows them, the lengths they go to keep each other safe, the battles they fight to stay alive, and the tragedies they endure.