"So if we stick to demonstrable facts, we don't get far," the scientist concluded. "But can we settle for mere speculation?"
"No, sir," Rick stated. "But let's admit that speculation has its uses. After all, circumstantial evidence is permitted in court. Speculation can give us the circumstances that need to be proved, and that tells us where to put our efforts. I think that's fair enough."
"So do I," Dr. Miller agreed.
Rick arose. "Then we'll continue working the way we've been doing it. It's not the best way, but at least we're uncovering little items that can be tied together if we find just two missing facts."
"Like what?" Barby demanded.
"We go back to our assumption that the ghost is man-made. On this assumption, the things we need to know are how and why is the ghost produced?"
CHAPTER XVI
Trapped!
It was, as Rick said, time for action and not for words. He and Scotty set out to track down every possible shred of evidence. They armed themselves with flashlights, and Rick made sure he had his pocket lens, and they started out.