"Is he here now?"
The detective pressed a button on his desk and a uniformed man appeared. Instructions were given, and a moment later Detective Cunningham stood before them wonderingly.
"I suppose you can prove beyond any shadow of a doubt," resumed the scientist, still addressing Mr. Mallory, "that two shots—and only two—were fired?"
"I can prove it by twenty witnesses," was the reply.
"Good, very good," exclaimed the scientist, and he turned to Cunningham.
"You know that only two shots were fired?"
"I know it, yes," replied Cunningham. "I fired 'em."
"May I see your revolver?"
Cunningham produced the weapon and handed it over. The Thinking Machine merely glanced at it.
"This is the revolver you used?"