Read it through once

“The letter to Hawkins--that I shall, of course, send on, since it is yours. Your letters are sacred to me. Your pardon, my friend, that unknowingly I did break the seal. Will you not cover it again?” He held out the letter to me, and with a courteous bow handed me a clean envelope. I could only redirect it and hand it to him in silence. When he went out of the room I could hear the key turn softly. A minute later I went over and tried it, and the door was locked.