"I will not fail," I said, much moved. So it had been Katherine Thurston all the time! "And that reminds me that I have here a letter which Miss Benbow charged me to give you,--an old letter written by her father. She thought you might care to keep it. Perhaps, under the circumstances, you'd better read it and then return it to me for safe keeping."

"I remember Senator Benbow very well,--a fine man!" Clyde said. He spoke absently, and I guessed that his mind was on other matters, but I had no intention of letting him disregard Jean's remembrance, or of letting the letter which she had treasured go into the hands of any careless court official.

"It concerns you, she said. Read it, and then I will take charge of it."

I handed him the old letter in its faded envelope, and turned to speak to the officer while Clyde should read it. The detective had watched us closely, but so long as Clyde made no move to leave the room--or to draw a revolver--he showed no disposition to interfere with our arrangements.

"How did you get information about him?" I asked the officer, merely to leave Clyde to himself for a moment.

"From Saintsbury. The police there are looking for him, and they wired us to be on the lookout."

"Then you agree with Jerome's theory that the villain always returns to the scene of his crime in the last act?" I said.

"Jerome? Does he say that?" The man looked puzzled. "Well, maybe he has found it so in New York. But I don't quite know what you mean by the last act."

A faint sound from Clyde made me turn. He was standing, supporting himself against the table, with a face so marked by emotion that I was startled into a cry. Whether his emotion was terror or joy or merely awe, I could not tell from his look, his face was so curiously changed. He held out to me the letter which he had been reading, and when I took it he dropped into the chair by the table and let his head fall upon his arm. I felt that it was the unconscious attitude of prayer, and I unfolded the letter with more anxiety than I can express. This is what I read:

"ON THE TRAIN, NEAR LESTER, TEXAS,