As a Thief in the Night by R. Austin Freeman

More than a week had passed since that eventful evening -- how eventful I did not then realize -- when I had delivered my simple treasures into Thorndyke's hands. But I was not uneasy; for, within twenty-four hours, I had found in my letter-box the promised note, assuring me that the preliminary operations had been safely carried through and that nothing had been damaged. Nor was I impatient. I realized that Polton had other work than mine on hand and that there was a good deal to do. Moreover, a little rush of business had kept me employed and helped me to follow Thorndyke's counsel and forget, as well as I could, the shadow of mystery and peril that hung over my friends, and, by implication, over me.

But on the evening of which I am now speaking I was free. I had cleared off the last of the day's work, and, after dining reposefully at my club, found myself with an hour or two to spare before bed-time; and it occurred to me to look in on Thorndyke to smoke a friendly pipe and perchance get a glimpse of the works in progress.