When the phone rang at three in the morning, Zhang Tianjiu knew something was up.
He opened his eyes and touched the old Nokia on the bedside. The words "Professor Ma" were displayed on the screen. Zhang Tianjiu frowned and pressed the answer button.
"Old Zhang, something happened." Professor Ma's voice was hoarse and urgent on the other end of the phone. There were faint human voices and mechanical roars in the background, "I need you to come to Shaanxi immediately. The car is already waiting for you downstairs."
