Maria Antonia and her confidant appeared to be on the eve of success, when the plan was upset, from a quarter in which they had not dreamed of danger. Among the ladies of the court of the Dowager Electress was one whose name does not transpire, who seems to have entertained an ardent passion for Agdolo. He, however, disregarded her, and paid his attentions to another of the ladies. Rage and jealousy consumed the heart of this slighted beauty, and when the Electress Mother confided to her the plan she had formed, the lady-in-waiting saw that her opportunity had arrived for the destruction of the man who had slighted her charms. She managed to get hold of her mistress' keys and to make a transcript of her papers, wherein the whole plan was detailed, also of copies of her letters to Agdolo, and of the Marquis's letters to her. When she had these, she at once despatched them--not to the Elector of Saxony, but to Frederick II. at Berlin, who stood in close relations of friendship with the Elector of Saxony. She had reckoned aright. Such tidings, received through the Court of Prussia, would produce a far deeper impression on Frederick Augustus, than if received from her unknown and insignificant self. It is possible also that she may have known of her mistress having been at Berlin and there thrown out hints of something of the sort, so that Frederick II. would at once recognise in this matured plan the outcome of the vague hints of mischief poured out at Potsdam a few years before. All was going on well at Berlin. Adolphus von Zehmen, Electoral Treasurer, had already started for Munich, furnished with the requisite sums. He was empowered to receive the deed of relinquishment from the Dowager Electress, and also her diamond necklace, which, in the meantime, was to be brought by a special courier from Rome. Maria Antonia, on her side, had constituted Councillor Hewald her plenipotentiary; she wrote to say that he would transact all the requisite negociation with the Treasurer Zehmen, and that the diamond necklace had arrived and was in his hands. Agdolo received orders from the Electress Mother on no account to leave Dresden till the middle of September, 1776, lest his departure should arouse suspicion. The conduct of the Marquis was not in any way remarkable, he moved about among old friends with perfect openness, often appeared in Court, and was satisfied that he was perfectly safe. He was not in the least aware that all his proceedings were watched and reported on, not by order of the Elector, but of his own mistress, who received regular reports from this emissary as to the behaviour and proceedings of the Marquis, so that she was able to compare with this private report that sent her by Agdolo, and so satisfy herself whether he was acting in her interest, or playing a double game.