Sherlock + canon references: A Scandal in Bohemia

“I am immensely indebted to you. Pray tell me in what way I can reward you. This ring—” He slipped an emerald snake ring from his finger and held it out upon the palm of his hand.
“Your Majesty has something which I should value even more highly,” said Holmes.
“You have but to name it.”
“This photograph!”
The King stared at him in amazement.
“Irene’s photograph!” he cried. “Certainly, if you wish it.”
… And when he speaks of Irene Adler, or when he refers to her photograph, it is always under the honourable title of
the woman.