Follow 12 year old Brendan (voice of Evan McGuire) as he battles Vikings and confronts an ancient serpent god on a mission to locate a legendary crystal and complete the mythical Book of Kells. Brendan lives in a heavily fortified medieval outpost known as the Abbey of Kells, where the ongoing threat of Viking raids causes the peaceful monks to live in a state of constant fear. Along with his uncle, Abbot Cellach, Brendan labors to fortify the abbey walls daily so his people will be protected from invading forces. When the mysterious Brother Aidan arrives at the abbey carrying an unfinished tome filled mystical secrets, Brendan becomes illuminated, and his dormant talents are awakened. The book must be finished, but accomplishing that mission will be no simple task. As the Vikings close in, Brendan ventures into the surrounding forest and prepares to confront his darkest fears. Accompanying him on his dangerous mission is Aisling, a half-wolf/half-human fairy whose powers will help to guide Brendan through this enchanting yet dangerous new world. Directed by Tomm Moore.