“I hope he has refastened the catch,” said our eccentric companion; “but not with noisiness.” “Why do you fear his making a noise?” asked Coram, curiously. “Outside, upon the landing,” replied Moris Klaw, “is a tall piece of a bas-relief; it leans back against the wall. You know it?” “Certainly.” “To-night, you did not look behind it, in the triangular space so formed.” “There’s no occasion. A man could not get in there.” “He could not, you say? No? That exploits to me, Mr. Coram, that you have no eye for capacity! But if you are wrong, what then?” “Any one hiding there would have to remain in hiding until the morning. He could not gain access to any of the rooms; all are locked, and he could not go downstairs, because of the night attendant in the hallway.” “No? Yes? You are two times wrong! First--someone is concealed there!” “Mr. Klaw!” began Coram, excitedly. “_Ssh!_” Moris Klaw raised his hand. “No excitement. It is noisy and a tax upon the nerves. Second--you are wrong, because presently that hidden one will come into the Egyptian Room!” “How? How in Heaven’s name is he going to _get_ in?” “We shall see.” Utterly mystified, Coram and I stared at Moris Klaw, for we stood one on either side of him; but he merely wagged his finger enjoining us to silence, and silent perforce we became. The view was a cramped one, and standing there looking out at the clear summer night, I for one grew very weary of the business. But I was sustained by the anticipation that the mystery of the headless mummies was about to come to a climax. I felt very sorry for poor Grimsby, cramped in the corner of the Egyptian Room, for I knew him to be even more hopelessly in the dark respecting the purpose of these manœuvres than I was myself. In vain I racked my brain in quest of the link which united the ancient “Book of the Lamps” with the singular case which had brought us there that night. Coram began to fidget, and I knew intuitively that he was about to speak. “_Ssh!_” whispered Moris Klaw. A beam of light shone out beneath us, across the Egyptian Room! I concluded that something had attracted the attention of Grimsby. I leaned forward in tense expectancy, and Coram was keenly excited. The beam of light moved; it shone upon the door of the very case in the corner of which Grimsby was hiding, but upon the nearer end, fully upon the face of a mummy. A small figure was dimly discernible, now, the figure of the man who carried the light. Cautiously he crossed the room. Evidently he held the key of the wall case, for in an instant he had swung the door back and was hauling the mummy on to the floor. Then out upon the midnight visitor leapt Grimsby. The light was extinguished--and Moris Klaw, drawing back from the window, seized Coram by the arm, crying, “The key of the door! The key of the door!”