Explorations Unlimited had its headquarters at Unhao, on the Irrawaddy River, northeast of Rangoon near the Chinese border.

“Why don’t you ship Biff out to me for a few weeks?” Uncle Charlie had suggested. “He could get a glimpse of the other side of the world—learn a lot, too.”

Those words had been music to Biff’s young ears. A family council had been held, and it had been agreed that the trip would be a good way for Biff to spend the remainder of his summer vacation.

“About a month after your uncle’s visit,” Tang continued, “two men, countrymen of mine, traveling on Burmese passports, arrived here. They asked many questions about your uncle.”

“I still don’t see what that has to do with Biff’s going to Rangoon,” Mr. Brewster said.

“I try your patience,” Tang said. “Now to my point. Only last night these same two men came again to our city. This time, they were most curious about your son, Biff.”

CHAPTER III
Under Chinese Eyes

“You said two men,” Biff repeated. “I’ll just bet you that one of them was the joker who paid me a visit this morning!”

“You had a visitor? Early this morning?” Ling Tang asked.

“I’ll say I did. Not a visitor, though. A spy, maybe—sneaking around the yard and—”