From the publisher:
Precocious siblings Lucy (Georgie Henley, The Chronicles of Narnia series) and Edmund Pevensie (Skandar Heynes, The Chronicles of Narnia series), along with their cousin Eustace (Will Poulter, Son of Rambow), are swallowed into a painting and transported back to Narnia. They join King Caspian (Ben Barnes, Dorian Gray) and a noble mouse named Reepicheep in a quest to rescue noble lords who had been lost fighting evil on another island. Aboard the magnificent ship The Dawn Treader, the courageous voyagers travel to mysterious islands, confront mystical creatures, and reunite with the Great Lion Aslan on a mission that tests their characters to determine the fate of Narnia itself! Based on the book by C.S. Lewis.