The Voyage of the Dawn Treader ( Chronicles of Narnia (HarperCollins Hardcover) #05 ) by C.S. Lewis

In the fifth book of "The Chronicles of Narnia", Lucy and Edmund, accompanied by their peevish cousin Eustace, are magically transported onto the "Dawn Treader", where King Caspian is searching for the seven lost friends of his father. On the voyage, the children meet many fantastic creatures, including the great Aslan himself. Full-color illustrations.