LEAD:  Former Globe & Mail "Lunch with..." columnist Jan Wong's new book comes out of an incident she described in her bestselling book "Red China Blues". While re-reading an old diary she found a startling entry she had totally forgotten. As a university student studying at Beijing University in China, one of just two north american students in the whole country, she had denounced a Chinese student who had asked her how to get to America. The girl was expelled from school. Now more than thirty years later, Jan Wong returns to a much different China find out what happened and why in Beijing Confidential.

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END CUE: "...published by Doubleday Canada."