"But I don't—and I have a plan by which we will make it all clear."
"To visit Professor Andreas?"
"No, we shall find our solution nearer than Scotland. I will tell you what we shall do. You know that skylight which overlooks the central hall? We will leave the electric lights in the hall, and we will keep watch in the lumber-room, you and I, and solve the mystery for ourselves. If our mysterious visitor is doing four stones at a time, he has four still to do, and there is every reason to think that he will return to-night and complete the job."
"Excellent!" I cried.
"We shall keep our own secret, and say nothing either to the police or to Simpson. Will you join me?"
"With the utmost pleasure," said I, and so it was agreed.
It was ten o'clock that night when I returned to the Belmore Street Museum. Mortimer was, as I could see, in a state of suppressed nervous excitement, but it was still too early to begin our vigil, so we remained for an hour or so in his chambers, discussing all the possibilities of the singular business which we had met to solve. At last the roaring stream of hansom cabs and the rush of hurrying feet became lower and more intermittent as the pleasure-seekers passed on their way to their stations or their homes. It was nearly twelve when Mortimer led the way to the lumber-room which overlooked the central hall of the museum.
He had visited it during the day, and had spread some sacking so that we could lie at our ease, and look straight down into the museum. The skylight was of unfrosted glass, but was so covered with dust that it would be impossible for anyone looking up from below to detect that he was overlooked. We cleared a small piece at each corner, which gave us a complete view of the room beneath us. In the cold, white light of the electric lamps everything stood out hard and clear, and I could see the smallest detail of the contents of the various cases.
Such a vigil is an excellent lesson, since one has no choice but to look hard at those objects which we usually pass with such half-hearted interest. Through my little peep-hole I employed the hours in studying every specimen, from the huge mummy-case which leaned against the wall to those very jewels which had brought us there, which gleamed and sparkled in their glass case immediately beneath us. There was much precious gold-work and many valuable stones scattered through the numerous cases, but those wonderful twelve which made up the urim and thummim glowed and burned with a radiance which far eclipsed the others. I studied in turn the tomb-pictures of Sicara, the friezes from Karnak, the statues of Memphis, and the inscriptions of Thebes, but my eyes would always come back to that wonderful Jewish relic, and my mind to the singular mystery which surrounded it. I was lost in the thought of it when my companion suddenly drew his breath sharply in, and seized my arm in a convulsive grip. At the same instant I saw what it was which had excited him.
I have said that against the wall—on the right-hand side of the doorway (the right-hand side as we looked at it, but the left as one entered)—there stood a large mummy-case. To our unutterable amazement it was slowly opening. Gradually, gradually, the lid was swinging back, and the black slit which marked the opening was becoming wider and wider. So gently and carefully was it done that the movement was quite imperceptible. Then, as we breathlessly watched it, a white, thin hand appeared at the opening, pushing back the painted lid, then another hand, and finally a face—a face which was familiar to us both, that of Professor Andreas. Stealthily he slunk out of the mummy-case, like a fox stealing from its burrow, his head turning incessantly to left and to right, stepping, then pausing, then stepping again, the very image of craft and of caution. Once some sound in the street struck him motionless, and he stood listening, with his ear turned, ready to dart back to the shelter behind him. Then he crept onwards again upon tiptoe, very, very softly and slowly, until he had reached the case in the centre of the room. Then he took a bunch of keys from his pocket, unlocked the case, took out the Jewish breast-plate, and, laying it upon the glass in front of him, began to work upon it with some sort of small, glistening tool. He was so directly underneath us that his bent head covered his work, but we could guess from the movement of his hand that he was engaged in finishing the strange disfigurement which he had begun.