Tiananmen Square, 1989. As tanks roll through Beijing and soldiers hammer on his hotel door, Joe - a young American photojournalist - captures a piece of history. In New York, 2012 Joe is covering a presidential election, marred by debate over cheap labour and the outsourcing of American jobs to Chinese factories. When a cryptic message is left in a Beijing newspaper, Joe is driven to discover the truth behind the unknown hero he captured on film. Who was he? What happened to him? And could he still be alive?