Marguerite, Lady Blakeney, is powerless to intervene as her husband Sir Percy walks into a trap.
Marguerite St Just, now Lady Blakeney, has followed her husband Sir Percy to France after discovering that that amiable idiot is none other than the dashing Scarlet Pimpernel, responsible for saving so many from the guillotine — including, she hopes, her brother Armand. Concealed behind a curtain in a dirty Calais café, she watches in horror as Citizen Chauvelin draws his net tight around the heedless aristocrat.
Lady Blakeney agrees to spy for the French Revolutionary government in return for her brother’s life.
In exchange for her brother Armand’s life, Marguerite, Lady Blakeney, is reluctantly playing the spy at a society ball. Citizen Chauvelin, of the French Revolutionary government’s secret police, wants her to find out what she can about the mysterious ‘Scarlet Pimpernel’ who has been rescuing prisoners from the guillotine.