I started, nervously, clutching at Smith’s arm.  It felt hard as iron to my grip.

“Hullo!” I heard Slattin call—­“who is speaking? . . .  Yes, yes!  This is Mr. A. S. . . .  I am to come at once ? . . .  I know where—­yes I . . . you will meet me there? . . .  Good!—­I shall be with you in half an hour . . . .  Good-by!”

Distinctly I heard the creak of the revolving office-chair as Slattin rose; then Smith had me by the arm, and we were flying swiftly away from the door to take up our former post around the angle of the building.  This gained: 

“He’s going to his death!” rapped Smith beside me; “but Carter has a cab from the Yard waiting in the nearest rank.  We shall follow to see where he goes—­for it is possible that Weymouth may have been thrown off the scent; then, when we are sure of his destination, we can take a hand in the game!  We . . .”

The end of the sentence was lost to me—­drowned in such a frightful wave of sound as I despair to describe.  It began with a high, thin scream, which was choked off staccato fashion; upon it followed a loud and dreadful cry uttered with all the strength of Slattin’s lungs—­

“Oh, God!” he cried, and again—­“Oh, God!”

This in turn merged into a sort of hysterical sobbing.

I was on my feet now, and automatically making for the door.  I had a vague impression of Nayland Smith’s face beside me, the eyes glassy with a fearful apprehension.  Then the door was flung open, and, in the bright light of the hall-way, I saw Slattin standing—­swaying and seemingly fighting with the empty air.

“What is it?  For God’s sake, what has happened!” reached my ears dimly —­and the man Burke showed behind his master.  White-faced I saw him to be; for now Smith and I were racing up the steps.

Ere we could reach him, Slattin, uttering another choking cry, pitched forward and lay half across the threshold.

We burst into the hall, where Burke stood with both his hands raised dazedly to his head.  I could hear the sound of running feet upon the gravel, and knew that Carter was coming to join us.

Burke, a heavy man with a lowering, bull-dog type of face, collapsed onto his knees beside Slattin, and began softly to laugh in little rising peals.

“Drop that!” snapped Smith, and grasping him by the shoulders, he sent him spinning along the hallway, where he sank upon the bottom step of the stairs, to sit with his outstretched fingers extended before his face, and peering at us grotesquely through the crevices.

There were rustlings and subdued cries from the upper part of the house.  Carter came in out of the darkness, carefully stepping over the recumbent figure; and the three of us stood there in the lighted hall looking down at Slattin.

“Help us to move him back,” directed Smith, tensely; “far enough to close the door.”

Between us we accomplished this, and Carter fastened the door.  We were alone with the shadow of Fu-Manchu’s vengeance; for as I knelt beside the body on the floor, a look and a touch sufficed to tell me that this was but clay from which the spirit had fled!