The One and Only Ivan by Katherine Applegate is a heartwarming novel told from the perspective of Ivan, a silverback gorilla who lives in a cage at a shopping mall. He's used to his confined life and spends his time watching TV, drawing, and talking with his animal friends. But when a young elephant named Ruby arrives, Ivan begins to see his world differently—and realizes he may need to take action to protect her. It's a story about friendship, hope, and finding the courage to make a change.