Adventure action and danger await 12 year old Brendan who must fight Vikings and a serpent god to find a crystal and complete the legendary Book of Kells.

Brendan is hard at work with his uncle, Abbott Cellach (Brendan Gleeson) and the other monks, helping to strengthen the abbey walls as protection against the Viking raids. But a new life of adventure begins with the a arrival of Brother Aidan, a` celebrated " ester illuminator who initiates Brendan into the art of illumination awakening his hidden, but extraordinary talents.

I order to finish the magnificent book, Brendan has to overcome his deepest fears on a secret quest that will take him, for the first time ever, beyond the abbey's walls into the enchanted- forest were dangerous mythical creatures hide. It is "here he meets the fairy Aisling, a mysterious young white wolf/ girl, who will become his closest friend and helper.

But with the terrifying Viking hordes closing in, will Brendan succeed in his quest to illuminate the darkness and prove that enlightenment is the best fortification against barbarians?