Geralt is invited to the southern province of Toussaint run by a feisty duchess and her order of knights fanatically committed to chivalry to stop a mysterious serial killer monster that's targeting knights with dark past. Geralt discovers that the monster is in fact a vampire that's desecrating the bodies of the knights he's killed to make fun of their supposed commitment to five virtues - compassion, honor, generosity, valor and wisdom. The killer's friend and Geralt's old companion Regis aids Geralt in finding the killer but what they discover about the killer's motives changes everything.