He must get at M. de Tréville； it was important that he should be informed of what was going on. D’Artagnan resolved to endeavour to get into the Louvre. His costume of a guard in the company of M. des Essarts would， he thought， be a passport for him.
As he was arriving at the end of the Rue Guénégaud he saw， coming out of the Rue Dauphine， two persons whose appearance struck his attention. One was a man， and the other a woman.
The woman had Madame Bonacieux’s figure， and the man resembled Aramis so much as to be mistaken for him.
Besides， the woman had on that black cloak， which D’Artagnan could still see outlined upon the shutter of the Rue de Vaugirard， and upon the door of the Rue de la Harpe.
And still further， the man wore the uniform of the musketeers.
The woman’s hood was pulled down， and the man held his handkerchief up to his face. Both， as this double precaution indicated—both had an interest， then， in not being recognized.
They followed the bridge. That was D’Artagnan’s road， since D’Artagnan was going to the Louvre. D’Artagnan followed them.
He had not gone twenty steps before he became convinced that the woman was really Madame Bonacieux， and the man Aramis.
He felt at that instant all the suspicions of jealousy agitating his heart.
He was doubly betrayed—by his friend， and by her whom he already loved as a mistress. Madame Bonacieux had sworn by all that was holy that she did not know Aramis， and a quarter of an hour after she had taken this oath he found her hanging on Aramis’s arm.
The young man and woman had perceived they were followed， and had redoubled their speed. D’Artagnan hastened on， passed them， then turned on them at the moment they were before the Samaritaine， which was illuminated by a lamp that threw its light over all this part of the bridge.
D’Artagnan stopped before them， and they stopped before him.
“What do you want， sir？” demanded the musketeer， drawing back a step， and with a foreign accent which proved to D’Artagnan that he was deceived in one part of his conjectures at least.
“It is not Aramis！” cried he.
“No， sir， it is not Aramis； and by your exclamation， I perceive you have mistaken me for another， and pardon you.”
“You pardon me！” cried D’Artagnan.
“Yes，” replied the unknown. “Allow me， then， to pass on， since it is not with me you have anything to do.”
“You are right， sir； it is not with you I have anything to do. It is with madame here.”
“With madame！ You do not know her！” replied the stranger.
“You are mistaken， sir； I know her very well.”
“Ah，” said Madame Bonacieux， in a tone of reproach—“ah， sir， I had the promise of a soldier and the word of a gentleman. I thought I might have depended upon them！”
“And I， madame！” said D’Artagnan， embarrassed； “you promised me—”
“Take my arm， madame，” said the stranger， “and let us proceed on our way.”
D’Artagnan， however， stupefied， cast down， annihilated by all that had happened， stood， with his arms crossed， before the musketeer and Madame Bonacieux.
The musketeer advanced a step or two and pushed D’Artagnan aside with his hand.
D’Artagnan made a spring backwards， and drew his sword.
At the same time， and with the rapidity of lightning， the unknown drew his.
“In the name of Heaven， milord！” cried Madame Bonacieux， throwing herself between the combatants， and seizing the swords with her hands.
“Milord！” cried D’Artagnan， enlightened by a sudden idea—“milord！ Pardon me， sir， but are you not—”
“Milord， the Duke of Buckingham！” said Madame Bonacieux in an undertone； “and now you may ruin us all.”
“Milord—madame—I ask a hundred pardons. But I love her， milord， and was jealous. You know what it is to love， milord. Pardon me， and then tell me how I can risk my life to serve your grace.”
“You are a good young man！” said Buckingham， holding out his hand to D’Artagnan， who pressed it respectfully. “You offer me your services； I accept them. Follow us at a distance of twenty paces to the Louvre， and if any one watches us， slay him！”
D’Artagnan placed his naked sword under his arm， allowed the duke and Madame Bonacieux to proceed twenty steps， and then followed them， ready to carry out to the letter the instructions of the noble and elegant minister of Charles I.
But fortunately the young seid had no opportunity to give the duke this proof of his devotion， and the young woman and the handsome musketeer entered the Louvre by the wicket of L’Echelle without any interference.
As for D’Artagnan， he immediately repaired to the tavern of the Pomme de Pin， where he found Porthos and Aramis， who were waiting for him. But， without giving them any explanation of the inconvenience he had caused them， he told them that he had himself terminated the affair in which he had thought for a moment he should need their assistance.
And now， carried away as we are by our story， we must leave our three friends to return each to his own home， and follow the Duke of Buckingham and his guide through the windings of the Louvre.
1
Madame Bonacieux and the duke entered the Louvre without difficulty. Madame Bonacieux was known to belong to the queen； the duke wore the uniform of the musketeers of M. de Tréville， who， as we have said， were that evening on guard.
