Message from Hong Kong

From Google Books: "What did the crypic message from Hong Kong mean? To Marcia Lowry's father-in-law, it indicates that his ne'er-do-well son Dino is still alive three years after he has inexplicably vanished. Since Mr. Lowry is an invalid and Marcia wishes to marry again and begin a new life, it is up to her to fly to the Far East and try to track down the wayward husband she no longer wants."

Published in 1969 while Hong Kong was still a Crown Colony and mainland China was shut fast against foreigners.