The setting is nearly always in a universe strongly inspired by a precise historical period, well documented, but that is different from real world events by the presence of wondrous elements (magic, supernatural creatures).
These elements influence the portrayal of the chosen period as people in this world are keenly aware that they coexist with the supernatural and Pevel sometimes provides small changes to actual historical events.
After returning to the city after a mission accomplished for the Order of the Temple, Kantz must deal with a horde of ghouls who are tracking and killing several people in the town.
After the end of the Napoleonic Wars in 1815, the faerie kingdom of Ambremer, which dominates the OutreMonde, revealed itself to humanity and, with its various wonders, the existence of magic.
The story follows Louis Denizart Hippolyte Griffont, a mage from the Cyan Circle (one of the three circles of magic) who assist Parisians with magical related problems, and his estranged wife, Baroness Isabel de Saint-Gil, a fairie formerly belonging to Queen Méliane's ladies-in-waiting and now a professional thief, as they deal in the world of intrigues that lurk beneath the wonders of Paris.
Disbanded after the disastrous failure of the Siege of La Rochelle (a divergence from history in which the siege was successful), the Blades are reassembled by the Cardinal to track down the missing son of a Spanish noble just as the French and Spanish are conducting secret peace negotiations as the Thirty Years' War in the Holy Roman Empire is growing to include foreign powers.
An ancient organization called the Dark Claw (Griffe Noire) is attempting to reestablish draconic hegemony over the world by using magic to make dragons assume human form.
Their power was broken when the first High King, Erklant I, defeated Serk'Arn, the Dragon of Destruction, five hundred years before the story begins.
However, the once mighty High Kingdom is now on the verge of civil war as a growing faction of noble men led by the Duke of Feln oppose the Queen's regency.