In this adaptation of the fifth novel in the Narnia series (the third instalment of the Chronicles of Narnia film series), Lucy and Edmund Pevensie are whisked back to Narnia in the company of their cousin Eustace Stubbs. Here, they find themselves taking part in King Caspian's attempt to keep the vow that he made at his coronation, to find his father's seven friends (banished when his wicked uncle usurped the throne) and to make Narnia a great sea power once again.