Chapter 48

"But when will it be safe?" cried the Professor excitedly. "When Peterson knows that your secret is in my possession, and that therefore murdering you will avail him nothing," answered Mr. Robinson calmly. "But how do I know you will keep your word?" "You don't," said the other frankly. "You've got to trust me. At the same time I beg of you to use your common sense. Of what possible advantage is it to me to keep you here? I shall have to trust you to take no steps to incriminate me, and that I am fully prepared…