Upon gaining this advantage d'Artagnan was near uttering a cry of surprise; it was not Aramis who was conversing with the nocturnal visitor, it was a woman! D'Artagnan, however, could only see enough to recognize the form of her vestments, not enough to distinguish her features.
At the same instant the woman inside drew a second handkerchief from her pocket, and exchanged it for that which had just been shown to her. Then some words were spoken by the two women. At length the shutter closed. The woman who was outside the window turned round, and passed within four steps of d'Artagnan, pulling down the hood of her mantle; but the precaution was too late, d'Artagnan had already recognized Mme. Bonacieux.