The butler had hardly closed the door behind him when Lady Hilda was down on her knees at Holmes’s feet, her hands outstretched, her beautiful face upturned and wet with her tears.

“Oh, spare me, Mr. Holmes! Spare me!” she pleaded, in a frenzy of supplication. “For heaven’s sake, don’t tell him! I love him so! I would not bring one shadow on his life, and this I know would break his noble heart.”

Holmes raised the lady. “I am thankful, madam, that you have come to your senses even at this last moment! There is not an instant to lose. Where is the letter?”

She darted across to a writing-desk, unlocked it, and drew out a long blue envelope.

“Here it is, Mr. Holmes. Would to heaven I had never seen it!”