The protagonist of this novel discovers a fleur-de-lis burned into the skin of one character before 
The protagonist of this novel discovers a fleur-de-lis burned into the skin of one character before being sent to the siege of La Rochelle. That character is beheaded in Flanders after poisoning Constance and trying to kill the protagonist. Earlier, she uses two diamonds stolen from the Duke of (*) Buckingham to blackmail the French Queen Anne of Austria in a plot concocted by Cardinal Richelieu. For 10 points, name this novel in which Milady de Winter's schemes are stopped by Athos, Porthos, Aramis, and D'Artagnan, a work of Alexandre Dumas.
The protagonist of this novel discovers a fleur-de-lis burned into the skin of one character before being sent to the siege of La Rochelle.
The Three Musketeers [or Les Trois Mousquetaires]