She stopped, her attention attracted by a sound in the room. She looked toward the wall, away from the stairs.
Two sluice gates had opened, one on each side of the torpedo tube. Water was pouring into the room.
The girl knew that she and her companion were doomed. From the cellar above, the Red Envoy had released the switch that controlled the sluices. Harry and Arlette were helpless, in the midst of an increasing flood that was sweeping in from the lake.
CHAPTER XXVIII
MASTER MINDS MEET
ON this particular night, a strange effect came over the professor within a few minutes after he had taken his medicine.
Harry Vincent had scarcely left the room, when the white-haired old man began to gasp. Then he leaned forward upon the desk. His eyes closed, and he was still.
The door opened, and a figure entered. It came with amazing silence, and Professor Whitburn would not have observed it, had his eyes been open.
The Shadow leaned over Professor Whitburn. He pressed the old man’s forehead; then felt his pulse.
The old inventor was not dead; he was simply the victim of a powerful opiate. The wrong pills had been left on his desk by Marsh; and the action had been performed with the definite purpose of rendering Professor Whitburn unconscious.