866 Vikings land on the coast of Northern England and burn a village to the ground, at the same time rescuing a young man who was facing the death penalty that day. His invaders free him, name him Rolf, and he becomes their guide in the lands around him, since he hates the locals more than most. Warriors from the north did not come here to plunder or fight. They came to take revenge and will not leave just like that. Their mission develops into a full-scale invasion, but Rolf himself hides many secrets that he would not like to share with his new allies. Only, perhaps, the rage of the invaders is directed at the wrong people, and to find the true culprits of the unleashed massacre, you will need not strength, but intelligence and cunning. Thus begins a large-scale historical saga that tells the story of the sons of the legendary Ragnar Lothbrok, who will stop at nothing to take revenge on the murderers of their father.