Chapter 18 A NEW THEORY

"Those robbers probably came in a light, rubber-tired rig, left it somewhere around the corner, got into the bank, did the job and drove away again," was the opinion of Mr. Thompson, as he crawled out of the roof scuttle, followed by the boys.

"But how did they get to the roof?" asked Ned. "You've got to explain that."

"Easy enough," spoke th