“Any idea what your brother is doing in the Caribbean?” Mr. Brewster asked his wife.

Biff’s mother shook her head. “Not any more than you have, Tom. Have you heard from your uncle, Biff?”

“Only one letter since we got chased out of China,” the boy replied. “That came about a month after I got back home. All he said was that things were too hot for him to operate in the Orient for a while.”

“He is still with the firm of Explorations Unlimited, isn’t he?” Mr. Brewster asked.

“Oh, yes. Uncle Charlie said the company was negotiating a contract that would have him operating in this hemisphere. He didn’t say what kind of operation it was, though.”

“It must be tied in with his wanting you to come to Curaçao, son.”

“Looks that way, Dad. What about it, Mom?” Biff looked hopefully at his mother. She didn’t reply for a few moments. Then she said, “Well, I suppose—”

Mrs. Brewster never finished her sentence. The youngest members of the Brewster family burst into the study.

“Mom! Dad! It’s a cablegram!” eleven-year-old Ted Brewster shouted, waving an envelope over his head.

“Yes! Another one,” Monica, Ted’s twin sister, chimed in.