“Did Thinwell look inside?” Bertha asked.
“He says he just peeped inside the door. There’s something strange about that too. He said Kosling’s pet bat was flying around inside the room. That’s unusual. Unless bats are disturbed, they fly around at night. Now why should this bat have been flying around at three in the afternoon?”
“He must have been disturbed,” Bertha said.
“Exactly,” Sellers agreed. “And what disturbed him?”
“I’ll bite. What did?”
“It must have been the person who was putting up the trap gun. That brings up another interesting thing.”
“What?”
“I think the trap gun was set up by a blind man.”
“What makes you think so?”
“Because of the way it was set up. In the first place there was no attempt at concealment. The thing stuck out as big as an elephant, right where it could be seen by anyone entering the room. In the second place, in pointing the gun, the man who set it up didn’t squint along the sights the way, a man with vision would have done. He tied a thread along the barrel, pulled that thread tight, and used it to tell him where the charge was going. That’s one way of sighting a gun. It’s the hard way.”