Karr said testily, “You are indebted for the extra shot to what I told Mr. Mason. At the time, I thought there might have been two shots. Since then, and on thinking it over, I have come to the conclusion that there was only one shot, and perhaps an echo from the side of the adjoining house.”
“And how about the buzzing?” Tragg asked.
“The buzzing,” Karr said, “continued for a few minutes after the sound of the shot, and then ceased.”
“Think carefully. Did you hear it again?”
“No,” Karr said positively. “I didn’t hear it after that.”
Tragg studied him for a moment, then said, “It would have simplified matters if you’d told me this stuff when I first questioned you.”
Karr, staring right back at him, said, “And it would have simplified matters if you’d told me about the telephone receiver.”
“I didn’t know about the burglar alarm then.”
“And I didn’t know that the buzzing of a mosquito was important.”
“Then there was only one shot?”