|Brendan Gleeson||Abbot Cellach|
|Michael McGrath||Adult Brendan|
|Paul Young||Brother Square|
|Paul Tylac||Brother Assoua|
In the remote Irish woods, Cellach prepares a fortress for an impending attack by a Viking war party. Unbeknown to Cellach, his young nephew Brendan -- who has no taste for battle -- works secretly as an apprentice in the scriptorium of the local monastery, learning the ancient art of calligraphy. As the Vikings approach, revered illuminator Aidan arrives at the monastery and recruits Brendan to complete a series of dangerous, magical tasks.