"I think, if I may, I will take the key and the envelope all together. You can never tell what may or what may not help him, and the three things may hang together, and perhaps explain each other in some mysterious way."
"Very good—here's the whole bag of tricks. It's a queer business altogether, and I must say I feel inquisitive; certainly, if Hewitt can get anything out of those figures I shall be mighty curious to know how he does it. You'll come in again to-morrow, then?"
I promised I would, and walked off with the crumpled envelope, the little key, and the puzzling strip of figures. Since the lesson from Hewitt which I have alluded to, I had often amused myself with cryptogram reading, and I had never found a cypher message in a newspaper "agony-column" the meaning of which I could not get at with a little trouble. But this was something altogether beyond me; and if I have any reader who prides himself on his ability to read secret cypher, I recommend him to try his skill on this one before he reads further.
The circumstances, too, seemed as puzzling as the writing itself. Why, if any person wished to send a note and a key in a closed envelope, should he take the trouble to pack the note inside the key? Why, especially when the note was already written in so baffling a cypher? Whither had this ragged messenger been going with the mysterious package, and who had sent him, and why?
Guessing and musing, I reached home, and found that Hewitt had returned before me. I made my way into his office, and came on him sitting at his desk with a large lens, attentively examining a broken brass padlock.
"Am I bothering you?" I asked. "Are you on the bond robbery, now?"
Martin Hewitt nodded, with a jerk of the hand toward the padlock. "It's a tough job," he said, "and I shall shut myself up presently and think hard over it; just now I can't see my way into it at all. But what have you got there?"
"Never mind," I said, "you're too busy now. I came across something very odd at the hospital, which I thought would interest you—that's all."
"Very well, let me see it. I haven't begun my bout of cogitation yet. Show me."
I put the envelope, the key and the paper on the table before him. Hewitt, with a glance of surprise, picked up the key and examined it. "That's curious," he said, and straightway began fitting the key to the broken padlock on the desk.