I had often watched the gloomy walls of the prison as I passed, and wondered at the sensations of the prisoners when the gates closed behind them. My sensations as I drove into the courtyard and passed up the stairs, into the cell whose iron gate clanged shut behind me, were all poignant enough, but I could not be wholly downhearted. The whole thing seemed utterly absurd, yet as night came on, a deep gloom gradually settled over me. I could not see my way out. “Suppose the President and Secretary of War should both die, as had the last Secretary of the Navy!” I had no proof but the letter and the witnesses who saw the second message shine forth, and with that thought of witnesses came back the puzzling question, “Why did not the second message appear?” It had been there. I had seen it with my own eyes. Dorothy, Mrs. Hartnell, John King, Regnier,--each and all had seen it and read it. Tom had declared it impossible for the writing to disappear. What could be the explanation? One thought kept coming, returning to my mind again and again, as I sat on the edge of my narrow cot, watching the barred moonlight streaming through the great window opposite my tier. The letter must have been changed. The letter which we examined in the judge’s room could not be the same as that which had shown us the second message. Somewhere, somehow, an exchange must have been effected. It could have been no easy matter, either. Parchment of the kind used in all the letters was no easy thing to come by. It could by no means be bought in every stationer’s store, nor could so complete a copy of the message be produced without much trouble and labor. Only one man would be likely to have such a copy ready at hand, without the second message, the man who was trying to stop all war. He might have an extra copy. But how could he know the letter was in Dorothy’s hands? How could he get a chance to change the papers? Hour after hour, the long night through, I struggled with the question, and with the morning some crystallization came from the dull haze of my thoughts. There was one time and place where a man might easily make an exchange. At Mrs. Hartnell’s house in Washington, in the time which elapsed between the closing of the radium case and the turning on of the lights. It might be improbable, but it was the only solution I could find. Towards early morning I dropped off into a troubled sleep, and dreamed I was in court, where Regnier, as judge, was trying me, with John King as prosecuting attorney. I had just been condemned to disappear as had the Alaska, when Dorothy sailed through the courtroom in the Black Arrow’s launch, with Tom at the wheel. She reached out her hand to me. I leaped in and escaped.