It has been more than two weeks since Xiao Jianhua last crossed the threshold of his luxury suite at the Four Seasons hotel in Hong Kong. For a billionaire - even one with a relatively low profile like Xiao - to vanish would, in normal times, be alarming. But when the place he has been sucked into is the black hole of China’s security state, nerves have become increasingly rattled. Xiao is renowned for his close relationships and business dealings with elite families, including relatives of President Xi Jinping. Many believed those connections made him untouchable. Read more