High in the north, evil lurks. In the year 845, the Normans bring death to Paris. The murderers come via the rivers: In the morning, 120 dragon boats occupy the Seine island, and by evening, the streets are strewn with corpses. The smell of smoke hangs in the air. Helplessly, young Odo must watch as his father is killed and his mother is taken away. He vows revenge. Years later, he comes across a manuscript in the monastery of St. Gallen: The Book of Sins. It prophesies the downfall of the pagan world as soon as the seven deadly sins are atoned for. Obsessed with the idea of accomplishing this task, Odo sets out for the north. To the godless city of the Vikings, to Haithabu.