Watch A Viking Saga: The Darkest Day for Free: How to Stream the Movie Online at 123Movies. . Cast into a violent and bloody world of murder, Hereward, a novice monk, must deliver the Holy Gospel of Lindisfarne - a book of great beauty and power - to the safety of the Iona monastery, while being pursued by a Viking death squad hell- bent on its capture. On his way to the monastery, he meets a fierce and skilled swordsman who answers his prayers and dedicates his life to protecting Hereward while he delivers the book. In the midst of their journey, they are confronted by Vikings ready to kill in order to get what they want, leaving Hereward and his protector at their mercy.