With this game in mind, Dupin recounts the visit he made to the Minister’s apartment. After surveying the Minister’s residence, Dupin notices a group of visiting cards hanging from the mantelpiece. A letter accompanies them. It has a different exterior than that previously described by the prefect, but Dupin also observes that the letter appears to have been folded back on itself. He becomes sure that it is the stolen document. In order to create a reason for returning to the apartment, he purposely leaves behind his snuffbox. When he goes back the next morning to retrieve it, he also arranges for someone to make a commotion outside the window while he is in the apartment. When the Minister rushes to the window to investigate the noise, Dupin replaces the stolen letter with a fake. He justifies his decision to leave behind another letter by predicting that the Minister will embarrass himself when he acts in reliance upon the letter he falsely believes he still possesses. Dupin remarks that the Minister once wronged him in Vienna and that he has pledged not to forget the insult. Inside the fake letter, then, Dupin inscribes, a French poem that translates into English, “So baneful a scheme, if not worthy of Atreus, is worthy of Thyestes.”