Norway, AD 785. It began with the betrayal of a lord by a king.... King Gorm puts Jarl Harald's family to the sword but makes one fatal mistake - he fails to kill Harald's youngest son, Sigurd. His kin slain, his village seized and its people taken as slaves, Sigurd wonders if the gods have forsaken him. Hunted by powerful men, he is unsure who to trust, and yet he has a small band of loyal followers at his side.

An ancient blade, fit for the gods but tainted with a deadly curse. Bjarki Bloodhand has finally managed to subdue his gandr, the spirit that gives him the ferocity of a bear in battle. Yet losing his berserker prowess may leave him at the mercy of his foes. Meanwhile, his half-sister, the shield maiden Tor Hildarsdottir, has slain two warriors from the personal retinue of the new Jarl of Norrland – and now faces brutal reprisals for their deaths.

771AD, Northern Europe. Bjarki Bloodhand and Tor Hildarsdottir are journeying south into Saxony. Their destination is the Irminsul, the One Tree that links the Nine Worlds of the Middle-Realm. In this most holy place, they hope to learn how to summon their animal spirits so they can enter the ranks of the legendary berserkir: the elite frenzied fighters of the North.

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...

Bordeaux, 1367. Having angered the bloodthirsty Don Pedro, King of Castile, Sir Thomas Blackstone is thoroughly sick of his mission for the Prince of Wales, but must remain true to his oath. But this is the Hundred Years' War, and tensions are rising once more. With the Prince of Wales deeply unpopular in his Aquitainian lands, Blackstone, King Edward's Master of War, must return to French soil to help stem the tide of support for the King of France. Meanwhile, Henry, Blackstone's son, faces an incognito ride across France with his own motley band of outlaws and mercenaries.

AD 916. In the Orkney Isles, a young woman flees her home to save the life of her unborn child. Eighteen years later, a witch foretells that evil from her past is reaching out again to threaten her son. Outlawed from his home in Iceland, Einar Unnsson is thrown on the mercy of his Uncle, the infamous Jarl Thorfinn 'Skull Cleaver' of Orkney. He joins forces with a Norse-Irish princess and a company of wolfskin-clad warriors to become a player in a deadly game for control of the Irish sea.

Spring, AD 777. Sigurd Hring, new King of the Svear, is summoning all the greatest warriors of the North to his banner. He invites Bjarki Bloodhand, the famous berserkr, to swear an oath of fealty to him. But Bjarki has already sailed away to rescue a beautiful Saxon princess. Tor Hildarsdottir, sister of Bjarki, now oath-bound to a powerful Svearland jarl, finds herself unwillingly enrolled in Sigurd’s mighty army. When Sigurd Hring arrogantly rejects the overlordship of Siegfried, King of the Dane-Mark, red war is inevitable.

Anno Domini 1040. Christianity has swept unstoppably across Scandinavia, leaving few enclaves of the old ways clinging on to their fading world as King Olof of Sweden works to convert his people. A young warrior, Halfdan, has witnessed the ‘mercy' of the Christian lords, watched his people attacked, his village burned and the Odin stone toppled as heretical. Watched his father cut down by an ambitious Christian jarl and his zealous priest. Among the ashes of his world, he vowed an oath of vengeance before all the gods.

When his father is killed at Arsuf protecting King Richard, Thomas is knighted. His hopes of inheriting his family's manor are dashed when Prince John takes power in his brother's absence. With a handful of men, Sir Thomas is forced to travel to Sweden where he joins the Jarl Birger Brosa fighting the Estonians, Karelians and Slavs. Fighting in the harsh environment of a Baltic winter makes Sir Thomas and his men stronger. There he learns of further treachery and dishonour among Bishops, Kings and Princes who value thrones more than men.

A young Saxon boy and his mother are captured in a Viking raid. Fate transforms his destiny and, thanks to an ageing one-armed warrior, he wins his freedom and becomes one with the Vikings. Clan rivalries force Dragonheart and his new Jarl to sail the seas searching for a new home. Landing on the Isle of Man, they must fight for their very survival with enemies old and new seeking their destruction.