A series of historical murder mystery novels by Alan Gordon, set at the time that the The High Middle Ages was starting to tail off, detailing the adventures of Theophilos, a jester belonging to the titular Guild, an organisation that is basically You Meddling Kids taken to Machiavellian extremes. There are eight novels in total, though hopefully more will be forthcoming without readers having to resort to standing on the author's lawn with a box of cakes in one hand and a pitchfork in the other.