At Paris, just after dark one gusty evening in the autumn of 18--, I was enjoying the twofold luxury of meditation and a meerschaum, in company with my friend C. Auguste Dupin, in his little back library, or book-closet, au troisieme, No. 33, Rue Dunot, Faubourg St. Germain
Monsieur G believes anything he doesn't understand is odd
The perfect and his men have made searches. They even divided the ministral hotel into parts yet they have made no progess into finding the letter.
Dupin finds the letter behind a mantle piece
Dupin solves the case and returns the letter to the officer to be given to the original owner and be replaced to the real letter.
The letter is handed to the original owner by the perfect officer