a doubt that a gale was brewing.

"Shut that light off!" Hazelton commanded, fighting to repress a shudder.
"I can do better in the darkness. Now, go ahead, and I'll follow."

Tom started, but he went slowly now, feeling that this pace was more suited
to the condition of his chum's nerves. Harry followed resolutely, though
none but himself knew how much effort it took for him to keep on in the
face of such a nameless yet terrible dread as now assailed him.

To the rear a bulky, hulking figure rose and stood erect. With the softest
of steps this apparition of the night followed after them, until it stole
along, ghost-like, just behind Hazelton. Then a huge arm was raised,
threateningly, over Harry's head.

At that particular moment, as though insensibly warned, Hazelton stopped,
half-wheeling. In the next second Harry bounded back just out of reach of
the descending arm, the hand of which held something. But in that backward
spring Harry, in order to save himself from pitching into the water, was
oblige to turn toward Reade.

"Tom!" exploded the young engineer. "Flash the light here quickly!"

In the instant, however, that Harry had sprung backward the figure had
slipped noiselessly into the water to the left. As Reade wheeled about,
throwing on the light, he let the ray fall in the water to the right of the
wall. But no sign of the intruder appeared; the water had closed
noiselessly over the now vanished figure.

"What's the matter?" asked Reade, as he stood looking, then finally flashed