Francia AD 853. After a failed Viking raid on the Frankish coast over 20 years ago, Jarl Sven the Boar is forced to leave his only son, Torkel, as a hostage and warned never to raid Francia again or his son will die. In Hügelburg, a small town in East Francia, Torkel and his 9-year-old son Charles are ambushed at home. Before dying, Torkel thrusts a package into young Charles’s hands and tells him to flee Francia for Denmark in search of his grandfather Sven the Boar’s protection.

AD 865. The fierce Vikings stormed onto Saxon soil hungry for spoils, conquest, and vengeance for the death of Ragnar Lothbrok. Hundr, a Northman with a dog's name...a crew of battle hardened warriors...and Ivar the Boneless. Amidst the invasion of Saxon England by the sons of Ragnar Lothbrok, Hundr joins a crew of Viking warriors under the command of Einar the Brawler. Hundr fights to forge a warriors reputation under the glare of Ivar and his equally fearsome brothers, but to do that he must battle the Saxons and treachery from within the Viking army itself...

989 AD. Alfred the Great’s dream of a united England has been forged by his daughter Aethelfaed and grandson, King Aethelstan. The Vikings have been expelled from York following the death of Erik Bloodaxe, and for two generations there has been peace between Saxon and Dane. A new Viking warlord Olaf Tryggvason seeks revenge for Bloodaxe's death and the slaughter that followed, and has set his sights on a fresh assault on England’s shores. With Skarde Wartooth they set sail for Saxon lands, hungry for glory, conquest and vengeance.

Lindisfarne, AD 793. There had been portents - famine, whirlwinds, lightning from clear skies, serpents seen flying through the air. But when the raiders came, no one was prepared. They came from the North, their dragon-prowed longships gliding out of the dawn mist as they descended on the kingdom's most sacred site. It is 8th June AD 793, and with the pillage of the monastery on Lindisfarne, the Viking Age has begun. While his fellow monks flee before the Norse onslaught, one young novice stands his ground.

Rescued as an infant from the wreckage of his boat, Caelin ap Cadwyr has come to be raised as a Norseman, far from his homeland, his family, and his destiny. Given a new name - Rathulf Thorvaldarsson - the orphaned Briton is unaware that his chosen path as a Viking warrior is soon to be thrown wildly off course.