【明報專訊】Aperson of Chinese descent living in Hong Kong has suddenly come under the spotlight thanks to a spy case involving China and the US. His case is such that he could now be ranked as one of the three most noteworthy double agents after the Cold War. As shown by his case, Hong Kong has always been a centre of international espionage, with different sides taking advantage of Hong Kong's unique position to engage in all kinds of cloak-and-dagger activities.