"A backdoor, at least!" replied Raffles, with such a sly look at me that I had to turn aside to smile. It was the last time I smiled that day.

The door had opened as I turned, and an unmistakable detective had entered with two more sight-seers like ourselves. He wore the hard, round hat and the dark, thick overcoat which one knows at a glance as the uniform of his grade; and for one awful moment his steely eye was upon us in a flash of cold inquiry. Then the clerk emerged from the recess devoted to the Raffles Relics, and the alarming interloper conducted his party to the window opposite the door.

"Inspector Druce," the clerk informed us in impressive whispers, "who had the Chalk Farm case in hand. He'd be the man for Raffles, if Raffles was alive to-day!"

"I'm sure he would," was the grave reply. "I should be very sorry to have a man like that after me. But what a run there seems to be upon your Black Museum!"

"There isn't reelly, sir," whispered the clerk. "We sometimes go weeks on end without having regular visitors like you two gentlemen. I think those are friends of the Inspector's, come to see the Chalk Farm photographs, that helped to hang his man. We've a lot of interesting photographs, sir, if you like to have a look at them."

"If it won't take long," said Raffles, taking out his watch; and as the clerk left our side for an instant he gripped my arm. "This is a bit too hot," he whispered, "but we mustn't cut and run like rabbits. That might be fatal. Hide your face in the photographs, and leave everything to me. I'll have a train to catch as soon as ever I dare."

I obeyed without a word, and with the less uneasiness as I had time to consider the situation. It even struck me that Raffles was for once inclined to exaggerate the undeniable risk that we ran by remaining in the same room with an officer whom both he and I knew only too well by name and repute. Raffles, after all, had aged and altered out of knowledge; but he had not lost the nerve that was equal to a far more direct encounter than was at all likely to be forced upon us. On the other hand, it was most improbable that a distinguished detective would know by sight an obscure delinquent like myself; besides, this one had come to the front since my day. Yet a risk it was, and I certainly did not smile as I bent over the album of horrors produced by our guide. I could still take an interest in the dreadful photographs of murderous and murdered men; they appealed to the morbid element in my nature; and it was doubtless with degenerate unction that I called Raffles's attention to a certain scene of notorious slaughter. There was no response. I looked round. There was no Raffles to respond. We had all three been examining the photographs at one of the windows; at another three newcomers were similarly engrossed; and without one word, or a single sound, Raffles had decamped behind all our backs.

Fortunately the clerk was himself very busy gloating over the horrors of the album; before he looked round I had hidden my astonishment, but not my wrath, of which I had the instinctive sense to make no secret.

"My friend's the most impatient man on earth!" I exclaimed. "He said he was going to catch a train, and now he's gone without a word!"

"I never heard him," said the clerk, looking puzzled.