Ludwig Pallmann was an international salesman for machinery to pulverize grain, who travelled widely and spoke several languages. While in India, he encountered a mysterious man on a train who had the "light brown skin of a Eurasian, huge dark eyes, a rather small mouth, and an unusual chin line. The lower part of the jaw looked slightly deformed. Above all, there was this peculiarity of speech, this complete reliance upon an electronic gadget to...