Based on a true real - an anonymous letter sent to Nicolas de La Regnie in 1668 - the author manages to build a distracting item: we try to spread the fever in the Kingdom of France via contaminated wigs. To foil this macabre machinations, it requires using Dieudonné Danglet and beggars. Who wants to attempt to safeguard the kingdom? The Spanish, English, Flemish? ... Unless certain religious orders are part ... Anyway, our hero will be challenged. He will have to disguise, delving into a few fights and avoid being contaminated by the scourge of plague. A book well written and entertaining. We guess that the author has spent time at his desk research given the number of historical figures scattered throughout the novel, which does not spoil anything.