In order to satisfy her curiosity, discover this happy favourite, and be revenged on her petulant rival, she prevailed upon the jeweller to employ a scout, who should watch all night upon the stair, without the knowledge of any other person in the family, alleging, that in all likelihood, the housemaid gave private admittance to some lover who was the author of all the losses they had lately suffered, and that they might possibly detect him in his nocturnal adventures; and observing that it would be imprudent to intimate their design to Wilhelmina, lest, through the heedlessness and indiscretion of youth, she might chance to divulge the secret, so as to frustrate their aim.
A Swiss, in whose honesty the German could confide, being hired for this purpose, was posted in a dark corner of the staircase, within a few paces of the door, which he was directed to watch, and actually stood sentinel three nights, without perceiving the least object of suspicion; but, on the fourth, the evil stars of our adventurer conducted him to the spot, on his voyage to the apartment of his Dulcinea, with whom he had preconcerted the assignation.

Having made the signal, which consisted of two gentle taps on her door, he was immediately admitted; and the Swiss no sooner saw him fairly housed, than he crept softly to the other door, that was left open for the purpose, and gave immediate intimation of what he had perceived.

This intelligence, however, he could not convey so secretly, but the lovers, who were always vigilant upon these occasions, overheard a sort of commotion in the jeweller's chamber, the cause of which their apprehension was ingenious enough to comprehend.
We have formerly observed that our adventurer could not make his retreat by the door, without running a very great risk of being detected, and the expedient of the chimney he had no inclination to repeat; so that he found himself in a very uncomfortable dilemma, and was utterly abandoned by all his invention and address, when his mistress, in a whisper, desired him to begin a dialogue, aloud, in an apology, importing, that he had mistaken the door, and that his intention was to visit her father, touching a ring belonging to the young Count Melvil, which she knew Fathom had put into his hands, in order to be altered.
Ferdinand, seizing the hint, availed himself of it without delay, and, unbolting the door, pronounced in an audible voice, "Upon my honour, Mademoiselle, you wrong my intention, if you imagine I came hither with any disrespectful or dishonourable motive.

I have business with your father, which cannot be delayed till to-morrow, without manifest prejudice to my friend and myself; therefore I took the liberty of visiting him at these untimely hours, and it has been my misfortune to mistake the door in the dark.

I beg pardon for my involuntary intrusion, and again assure you, that nothing was farther from my thoughts than any design to violate that respect which I have always entertained for you and your father's family." To this remonstrance, which was distinctly heard by the German and his wife, who by this time stood listening at the door, the young lady replied, in a shrill accent of displeasure, "Sir, I am bound to believe that all your actions are conducted by honour; but you must give me leave to tell you, that your mistake is a little extraordinary, and your visit, even to my father, at this time of the night, altogether unseasonable, if not mysterious.