A severed head and a cry of “Witchcraft!” start a frenzied witch hunt in a sleepy German village. When her dead husband’s severed head appears on her doorstep, a local woman is charged with practicing heretical rituals. It is up to the knights to discover the truth behind the brutal murder before the torches are lit and the woman is burned at the stake. Their task proves daunting, though, as the townspeople have their own long-buried secrets and sins that they want to keep hidden - even if it means allowing the sacrifice of an innocent woman.

Raphael of Acre, a young initiate of the Shield-Brethren, becomes a war hero during a vicious battle for control of a Muslim stronghold. One of his companions, Eptor, is wounded in the battle and falls under the influence of strange hallucinations. When a superior plots to manipulate Eptor’s visions into war propaganda, Raphael struggles between duty to the cause and duty to his faith. Unable to reconcile his roles as Christian and soldier, Raphael seeks out an unlikely source of counsel - Francis of Assisi.

When a merchant appears at the Catalonian chapter house of the Shield-Brethren, seeking to hire guards for his caravan, young Andreas is suspicious. Knights with his martial prowess are above protecting mere cargo wagons. Yet Andreas’s wanderlust outweighs his concern, and soon the group is headed to the merchant’s mountain village - and into great danger. As the caravan approaches, a woman suffering from terrifying visions feverishly paints her latest revelation - in her own blood. The image horrifies her fellow villagers, who fear an imminent attack, or worse, the return of the brutal Inquisition.

In the late nineteenth century a mysterious group of English martial arts aficionados provided Sir Richard F. Burton, well-known expert on exotic languages and historical swordsmanship, a collection of long-lost manuscripts to translate. Burton’s work was subsequently misplaced, only to be discovered by a team of amateur archaeologists in the ruins of a mansion in Treiste. From Burton's translations and the original source material, the epic tale of The Mongoliad was recreated.

In the aftermath of the Mongolian invasion of 1241, beleaguered Christians struggle with the presence of a violent horde and a world turned upside down. Apocalyptic fever sweeps through Europe, infecting even the most rational individuals, leaving all to wonder if they are seeing the end times - or an hour when new heroes will emerge from the ruins of cataclysmic defeat.

An untested group of Shield-Brethren initiates stand before the sprawling Mongol army in a bloody circus of sadistic violence, while a hardened company of their finest roam the desolate wasteland of the Mongol empire, wrapping their dead in blood-soaked soil and struggling to find the strength to fight even as they mourn. The warrior-monks, both in the East and the West, sharpen their swords for a final battle. The Khan of Khans must be slain if Christendom is to survive.

Thirteenth-century Europe has been saved from annihilation at the hands of the Mongols, to be sure, but new and terrible threats are at hand: political and religious turmoil threaten to turn the warriors' world upside down once more. Painted against a rich backdrop of medieval mysticism and Russian folklore, Katabasis weaves together the tales of victor and victim alike in a fearless exploration of what it means not just to survive, but to truly live again.

Ocyrhoe, a young, cunning fugitive from Rome, safeguards a chalice of subtle but great power. Finding herself in France, she allies with the persecuted, pacifist Cathar sect in their legendary mountaintop stronghold, Montségur. There she resists agents of the Roman Church and its Inquisition, fights off escalating, bloody besiegement by troops of the King of France, and shields the mysterious cup from the designs of many. Percival, the heroic Shield-Brethren knight from The Mongoliad, consumed by his mystical visions of the Holy Grail, is also drawn to Montségur - where the chalice holds the key to his destiny.

Sigrid is a Shield-Maiden who yearns to break free of the restrictions of her father’s home and join the Sworn Men in an actual raiding expedition. When a small diplomatic party that includes members of the Shield-Brethren lands at her family’s holding on Göttland, the party’s second in command, Halldor, sees in Sigrid a vision of beauty and power that might challenge - and even destroy - many men.

Many were displeased with the “peace” King Richard of England brokered in the Holy Land, and his return from the Crusades wasn’t greeted with cheers, but rather shackles. Now a “guest” of the Holy Roman Emperor, the Lion-Hearted is being held for an exorbitant ransom…so much money that it seems unlikely that the silver will make its way from Britain to Germany.