Two English children, Jill Pole and Eustace Scrubb, embark on a quest to rescue Prince Rilian, the son of King Caspian X, who has been missing for years. Guided by Aslan's signs, they journey through treacherous landscapes, including the underground realm of the Emerald Witch. Their adventure tests their courage, faith, and resolve as they confront various challenges and uncover hidden truths.