Raina Lu carefully pulled a film-wrapped photo from between a stack of bank cards. The date in the corner was several years ago, but it was clearly well preserved; the colors were still vivid. The background was rippling lake water. On the shore stood a willow, branches swaying in the wind. A woman with a gentle smile leaned against the tree, looking back. The photographer had clearly been devoted, choosing an excellent angle. The result was stunning enough that you couldn't look away. This ...