Sixth-century Ireland . . . Five-year-old Fian finds solace from a difficult home life by drawing shapes and patterns in the sand. The artistry he reveals in interpreting the beauties of nature takes him to Iona, where he will be the 'fourth hand' on the Book of Kells, that great treasure of the Celts. Greeted on arrival by the imposing Colum (Columba), Fian is gradually drawn into a community of laughter and stories, prayer and scholarship. But his...