"Go ahead, old boy," thought Lupin, "cudgel your brains: you'll never spot it! Ah, if we had asked for Gilbert's pardon only, as Clarisse wished, you might have twigged the secret! But Vaucheray, that brute of a Vaucheray, there really could not be the least bond between Mme. Mergy and him.... Aha, by Jingo, it's my turn now!... He's watching me ... The inward soliloquy is turning upon myself... 'I wonder who that M. Nicole can be? Why has that little provincial usher devoted himself body and soul to Clarisse Mergy? Who is that old bore, if the truth were known? I made a mistake in not inquiring... I must look into this.... I must rip off the beggar's mask. For, after all, it's not natural that a man should take so much trouble about a matter in which he is not directly interested. Why should he also wish to save Gilbert and Vaucheray? Why? Why should he? ... " Lupin turned his head away. "Look out!... Look out!... There's a notion passing through that red-tape-merchant's skull: a confused notion which he can't put into words. Hang it all, he mustn't suspect M. Lupin under M. Nicole! The thing's complicated enough as it is, in all conscience!...

But there there was a welcome interruption. Prasville's secretary came to say that the audience would take place in an hour's time.

"Very well. Thank you," said Prasville. "That will do."

And, resuming the interview, with no further circumlocution, speaking like a man who means to put a thing through, he declared:

"I think that we shall be able to manage it. But, first of all, so that I may do what I have undertaken to do, I want more precise information, fuller details. Where was the paper?"

"In the crystal stopper, as we thought," said Mme. Mergy.

"And where was the crystal stopper?"

"In an object which Daubrecq came and fetched, a few days ago, from the writing-desk in his study in the Square Lamartine, an object which I took from him yesterday."

"What sort of object?"

"Simply a packet of tobacco, Maryland tobacco, which used to lie about on the desk."

Prasville was petrified. He muttered, guilelessly:

"Oh, if I had only known! I've had my hand on that packet of Maryland a dozen times! How stupid of me!"

"What does it matter?" said Clarisse. "The great thing is that the discovery is made."

Prasville pulled a face which implied that the discovery would have been much pleasanter if he himself had made it. Then he asked:

"So you have the list?"

"Yes."

"Yes."

"Show it to me."

And, when Clarisse hesitated, he added:

"Oh, please, don't be afraid! The list belongs to you, and I will give it back to you. But you must understand that I cannot take the step in question without making certain."

Clarisse consulted M. Nicole with a glance which did not escape Prasville. Then she said:

"Here it is."

He seized the scrap of paper with a certain excitement, examined it and almost immediately said:

"Yes, yes... the secretary's writing: I recognize it.... And the signature of the chairman of the company: the signature in red.... Besides, I have other proofs.... For instance, the torn piece which completes the left-hand top corner of this sheet..."

Holmes was up and out early. When he returned at lunchtime I noticed that his face was very grave.

“This is a more serious matter than I had expected, Watson,” said he. “It is fair to tell you so, though I know it will only be an additional reason to you for running your head into danger. I should know my Watson by now. But there is danger, and you should know it.”

“Well, it is not the first we have shared, Holmes. I hope it may not be the last. What is the particular danger this time?”

“We are up against a very hard case. I have identified Mr. John Garrideb, Counsellor at Law. He is none other than ‘Killer’ Evans, of sinister and murderous reputation.”

“I fear I am none the wiser.”

“Ah, it is not part of your profession to carry about a portable Newgate Calendar in your memory. I have been down to see friend Lestrade at the Yard. There may be an occasional want of imaginative intuition down there, but they lead the world for thoroughness and method. I had an idea that we might get on the track of our American friend in their records. Sure enough, I found his chubby face smiling up at me from the rogues’ portrait gallery. ‘James Winter, alias Morecroft, alias Killer Evans,’ was the inscription below.” Holmes drew an envelope from his pocket. “I scribbled down a few points from his dossier: Aged forty-four. Native of Chicago. Known to have shot three men in the States. Escaped from penitentiary through political influence. Came to London in 1893. Shot a man over cards in a night-club in the Waterloo Road in January, 1895. Man died, but he was shown to have been the aggressor in the row. Dead man was identified as Rodger Prescott, famous as forger and coiner in Chicago. Killer Evans released in 1901. Has been under police supervision since, but so far as known has led an honest life. Very dangerous man, usually carries arms and is prepared to use them. That is our bird, Watson — a sporting bird, as you must admit.”

“But what is his game?”

“Well, it begins to define itself. I have been to the houseagent’s. Our client, as he told us, has been there five years. It was unlet for a year before then. The previous tenant was a gentleman at large named Waldron. Waldron’s appearance was well remembered at the office. He had suddenly vanished and nothing more been heard of him. He was a tall, bearded man with very dark features. Now, Prescott, the man whom Killer Evans had shot, was, according to Scotland Yard, a tall, dark man with a beard. As a working hypothesis, I think we may take it that Prescott, the American criminal, used to live in the very room which our innocent friend now devotes to his museum. So at last we get a link, you see.”

“And the next link?”

“Well, we must go now and look for that.”

He took a revolver from the drawer and handed it to me.

“I have my old favourite with me. If our Wild West friend tries to live up to his nickname, we must be ready for him. I’ll give you an hour for a siesta, Watson, and then I think it will be time for our Ryder Street adventure.”