Twenty-two-year-old Su Nianxia took her mother's sketchbook from twenty-six years ago and took a bus for four hours through the mountains to find Xingluo Village in the depths of Yunnan. Doctors said she only had a year left. There was a man in the village wearing black-rimmed glasses. Three years ago, he carried the belongings of his deceased wife into the mountains and planted a kind of weed with silvery leaves in an abandoned classroom. People in the village said he was crazy. But Su Nianxia recognized that it was the grass that her mother had drawn again and again before she died - perhaps the only medicine in the world that could cure her disease.