And, suddenly, Lupin remembered: two years ago, Prasville and Daubrecq the deputy had had a personal encounter on the Place du Palais-Bourbon. The incident made a great stir at the time. No one knew the cause of it. Prasville had sent his seconds to Daubrecq on the same day; but Daubrecq refused to fight.

A little while later, Prasville was appointed secretary-general.

"Very odd, very odd," said Lupin, who remained plunged in thought, while continuing to observe Prasvile's movements.

At seven o'clock Prasville's group of men moved away a few yards, in the direction of the Avenue Henri-Martin. The door of a small garden on the right of the house opened and Daubrecq appeared. The two detectives followed close behind him and, when he took the Rue-Taitbout train, jumped on after him.

Prasville at once walked across the square and rang the bell. The garden-gate was between the house and the porter's lodge. The portress came and opened it. There was a brief conversation, after which Prasville and his companions were admitted.

"A domiciliary visit," said Lupin. "Secret and illegal. By the strict rules of politeness, I ought to be invited. My presence is indispensable."

Without the least hesitation he went up to the house, the door of which had not been been closed, and, passing in front of the portress, who was casting her eyes outside, he asked, in the hurried tones of a person who is late for an appointment:

"Have the gentlemen come?"

"Yes, you will find them in the study."

His plan was quite simple: if any one met him, he would pretend to be a tradesman. But there was no need for this subterfuge. He was able, after crossing an empty hail, to enter a dining-room which also had no one in it, but which, through the panes of a glass partition that separated the dining-room from the study, afforded him a view of Prasville and his five companions.

Prasville opened all the drawers with the aid of false keys. Next, he examined all the papers, while his companions took down the books from the shelves, shook the pages of each separately and felt inside the bindings.

"Of course, it's a paper they're looking for," said Lupin. "Bank-notes, perhaps... "

Prasville exclaimed:

"Whatrot! We shan't find a thing!"

Yet he obviously did not abandon all hope of discovering what he wanted, for he suddenly seized the four bottles in a liqueur-stand, took out the four stoppers and inspected them.

"Hullo!" thought Lupin. "Now he's going for decanter-stoppers! Then it's not a question of a paper? Well, I give it up."

Prasville next lifted and examined different objects; and he asked:

"How often have you been here?"

"Six times last winter," was the reply.

"And you have searched the house thoroughly?"

"Every one of the rooms, for days at a time, while he was visiting his constituency."

"Still... still ... ." And he added, "Has he no servant at present?"

"No, he is looking for one. He has his meals out and the portress keeps the house as best she can. The woman is devoted to us... "

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.”