"You will never understand," he said with a wry smile. "I seemed to die at that moment when I saw that Irma believed I was capable of robbing her. What did I care about my case?"

Hearing that, my opinion of Sadie's perspicacity went up marvellously. "Go on," I said.

I took down the letter from his dictation. It was written, he said, on expensive note-paper, without address, crest or seal, in a large and somewhat old-fashioned feminine hand.

"DEAR MR. QUARLES:

Although you have never heard of me I think of you as my dearest friend. I have followed your career from the time of your first appearance on the stage. I am one of those unfortunates who, condemned to live, are cut off from life. I watch life pass from behind my iron screen. It is you who, all unconscious, have supplied me with a dream to cheat my emptiness. I have warmed my cold hands at your fire.

"Now they tell me my release is at hand. I wish to show my gratitude to you in the only way that is possible to me. An artist's career is difficult and uncertain. I want to remove a little of the uncertainty from yours.

"I must avoid giving rise to silly gossip which would grieve my relatives. To avoid the publicity of probate I am making secret arrangements beforehand. An old friend will carry out my wishes for me when I am gone.

"The doctors give me a week longer. Upon my death this letter will be mailed to you. You will then hear from the Amsterdam Trust Company that a sum of money awaits your order. You will never know my name. But if you should let even the bare facts become known, some busybody would eventually connect them with my name, and unhappy gossip result. Therefore I ask you as a man of honour to keep the whole transaction locked in your breast."

"That is all," said Roland. "It was signed: 'Your grateful friend.'"

"Did you look in the recent obituaries for a clue?" I asked.