被窃的信的英文介绍
Clue
The Prefect makes two deductions with which Dupin does not disagree:1.) The contents of the letter have not been revealed, as this would have led to certain circumstances that have not arisen. Therefore Minister D— still has the letter in his possession. 2.) The ability to produce the letter at a moment’s notice is almost as important as possession of the letter itself. Therefore he must have the letter close at hand.