"
"Exactly," agreed Kennedy. "No one is going to approach that
chamber down-stairs as long as he thinks any one is watching, and
we do not know where they are watching. But the moment any sudden
great change is registered, such as turning on that electric
furnace, we shall know it here."
It must have been an hour that we sat there discussing the merits
of the case and speculating on the strange actions of Loraine
Keith.
Suddenly the red light flashed out brilliantly.
"What's that?" asked Carton quickly.
"I can't tell, yet," remarked Kennedy. "Perhaps it is nothing at
all. Perhaps it is a draught of cold air from opening the door. We
shall have to wait and see."
We bent over the little machine, straining our eyes and ears to
catch the visual and audible signals which it gave.
Gradually the light faded, as the thermopile adjusted itself to
the change in temperature.
Suddenly, without warning, a low-toned bell rang before us and a
bright-green light flashed up.
"That can have only one meaning," cried Craig excitedly.
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