Brendan is a 12-year-old monk who lives in the Abbey of Kells in 9th century Ireland. When his uncle's brother Aidan arrives, he decides to teach Brendan the art of manuscript illumination to help finish a secret book. Brendan discovers this art and leaves the abbey for the first time to gather materials. The Book of Kells is an illuminated Latin manuscript containing the Gospels that was created by Celtic monks around 800 AD, possibly started in Iona and continued in Kells. It remained in Kells until being sent to Dublin in 1654 and has been kept at Trinity College since 1661, making it one of the finest illuminated manuscripts remaining from the Middle Ages.