"Be at the third pillar from the left outside the Lyceum Theatre to-night at seven o'clock". Post marked, London, S.W. Date, July 7, best quality paper and an envelope from a packet costing sixpence.  (The Sign of Four)

 

"You really did it very well. You took me in completely. Until after the alarm of fire, I had not a suspicion. But then, when I found how I betrayed myself, I began to think. I had been told that if the King employed an agent it would certainly be you. And your address had been given me. Yet, with all this, you made me reveal what you wanted... I leave a photograph which he might care to possess; and I remain, dear Mr. Sherlock Holmes, Very truly yours, Irene Norton, nee Adler" (A Scandal in Bohemia)