Imagine if Jennifer Lawrence or Scarlett Johansson went missing and nobody knew where they had gone – even three months later. That is what happened to Fan Bingbing. Fan is one of China’s best known and highest-paid actors, thanks to a string of domestic hits such as Cell Phone and Double Xposure, and small roles in Iron Man 3 and X-Men: Days of Future Past. The 37-year-old was on the jury of the Cannes film festival last year, and is set to star in a new thriller opposite Jessica Chastain and Penelope Cruz. On 2 July this year she posted details of a visit to a children’s hospital in Tibet on Weibo (China’s answer to Twitter). Then her account went dead, leaving her 63 million followers, and pretty much the rest of China, wondering where she had gone…….