The historic ball given by the then Secretary of State for Foreign Affairs—Lord Grenville—was the most brilliant function of the year. Though the autumn season had only just begun, everybody who was anybody had contrived to be in London in time to be present there, and to shine at this ball, to the best of his or her respective ability.  
His Royal Highness the Prince of Wales had promised to be present. He was coming on presently from the opera. Lord Grenville himself had listened to the two first acts of Orpheus, before preparing to receive his guests. At ten o'clock—an unusually late hour in those days—the grand rooms of the Foreign Office, exquisitely decorated with exotic palms and flowers, were filled to overflowing. One room had been set apart for dancing, and the dainty strains of the minuet made a soft accompaniment to the gay chatter, the merry laughter of the numerous and brilliant company.
 
In a smaller chamber, facing the top of the fine stairway, the distinguished host stood ready to receive his guests. Distinguished men, beautiful women, notabilities from every European country had already filed past him, had exchanged the elaborate bows and curtsies with him, which the extravagant fashion of the time demanded, and then, laughing and talking, had dispersed in the ball, reception, and card rooms beyond.
 
Not far from Lord Grenville's elbow, leaning against one of the console tables, Chauvelin, in his irreproachable black costume, was taking a quiet survey of the brilliant throng. He noted that Sir Percy and Lady Blakeney had not yet arrived, and his keen, pale eyes glanced quickly towards the door every time a newcomer appeared.
 
He stood somewhat isolated: the envoy of the Revolutionary Government of France was not likely to be very popular in England, at a time when the news of the awful September massacres, and of the Reign of Terror and Anarchy, had just begun to filtrate across the Channel.
 
In his official capacity he had been received courteously by his English colleagues: Mr. Pitt had shaken him by the hand; Lord Grenville had entertained him more than once; but the more intimate circles of London society ignored him altogether; the women openly turned their backs upon him; the men who held no official position refused to shake his hand.
 
But Chauvelin was not the man to trouble himself about these social amenities, which he called mere incidents in his diplomatic career. He was blindly enthusiastic for the revolutionary cause, he despised all social inequalities, and he had a burning love for his own country: these three sentiments made him supremely indifferent to the snubs he received in this fog-ridden, loyalist, old-fashioned England.
 
But, above all, Chauvelin had a purpose at heart. He firmly believed that the French aristocrat was the most bitter enemy of France; he would have wished to see every one of them annihilated: he was one of those who, during this awful Reign of Terror, had been the first to utter the historic and ferocious desire “that aristocrats might have but one head between them, so that it might be cut off with a single stroke of the guillotine.” And thus he looked upon every French aristocrat, who had succeeded in escaping from France, as so much prey of which the guillotine had been unwarrantably cheated. There is no doubt that those royalist émigrés, once they had managed to cross the frontier, did their very best to stir up foreign indignation against France. Plots without end were hatched in England, in Belgium, in Holland, to try and induce some great power to send troops into revolutionary Paris, to free King Louis, and to summarily hang the bloodthirsty leaders of that monster republic.
 
Small wonder, therefore, that the romantic and mysterious personality of the Scarlet Pimpernel was a source of bitter hatred to Chauvelin. He and the few young jackanapes under his command, well furnished with money, armed with boundless daring, and acute cunning, had succeeded in rescuing hundreds of aristocrats from France. Nine-tenths of the émigrés, who were fêted at the English court, owed their safety to that man and to his league.
 
Chauvelin had sworn to his colleagues in Paris that he would discover the identity of that meddlesome Englishman, entice him over to France, and then . . . Chauvelin drew a deep breath of satisfaction at the very thought of seeing that enigmatic head falling under the knife of the guillotine, as easily as that of any other man.
 
Suddenly there was a great stir on the handsome staircase, all conversation stopped for a moment as the major-domo's voice outside announced,—
 
“His Royal Highness the Prince of Wales and suite, Sir Percy Blakeney, Lady Blakeney.”
 
Lord Grenville went quickly to the door to receive his exalted guest.
 
The Prince of Wales, dressed in a magnificent court suit of salmon-coloured velvet richly embroidered with gold, entered with Marguerite Blakeney on his arm; and on his left Sir Percy, in gorgeous shimmering cream satin, cut in the extravagant “Incroyable” style, his fair hair free from powder, priceless lace at his neck and wrists, and the flat chapeau-bras under his arm.
 
After the few conventional words of deferential greeting, Lord Grenville said to his royal guest,—
 
“Will your Highness permit me to introduce M. Chauvelin, the accredited agent of the French Government?”
 
Chauvelin, immediately the Prince entered, had stepped forward, expecting this introduction. He bowed very low, whilst the Prince returned his salute with a curt nod of the head.
 
“Monsieur,” said His Royal Highness coldly, “we will try to forget the government that sent you, and look upon you merely as our guest—a private gentleman from France. As such you are welcome, Monsieur.”
 
“Monseigneur,” rejoined Chauvelin, bowing once again. “Madame,” he added, bowing ceremoniously before Marguerite.
 
“Ah! my little Chauvelin!” she said with unconcerned gaiety, and extending her tiny hand to him. “Monsieur and I are old friends, your Royal Highness.”
 
“Ah, then,” said the Prince, this time very graciously, “you are doubly welcome, Monsieur.”
 
“There is someone else I would crave permission to present to your Royal Highness,” here interposed Lord Grenville.
 
“Ah! who is it?” asked t............