"Well, it begins to define itself. I have been to the house-agents. 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."
It was just four o'clock when we reached the curious apartment of Nathan Garrideb. Mrs. Saunders, the caretaker, was about to leave, but she had no hesitation in admitting us, for the door shut with a spring lock and Holmes promised to see that all was safe before we left. Shortly afterwards the outer door closed, her bonnet passed the bow window, and we knew that we were alone in the lower floor of the house. Holmes made a rapid examination of the premises. There was one cupboard in a dark corner which stood out a little from the wall. It was behind this that we eventually crouched, while Holmes in a whisper outlined his intentions.