There was silence for several minutes. Dr. Ransome was first to speak.
"Wonderful!" he exclaimed. "Perfectly amazing."
"How did Mr. Hatch happen to come with the electricians?" asked Mr. Fielding.
"His father is manager of the company," replied The Thinking Machine.
"But what if there had been no Mr. Hatch outside to help?"
"Every prisoner has one friend outside who would help him escape if he could."
"Suppose--just suppose--there had been no old plumbing system there?" asked the warden, curiously.
"There were two other ways out," said The Thinking Machine, enigmatically.
Ten minutes later the telephone bell rang. It was a request for the warden.
"Light all right, eh?" the warden asked, through the 'phone. "Good. Wire cut beside Cell 13? Yes, I know. One electrician too many? What's that? Two came out?"