During China's collectivist era in the late 1950s, a rural work team responsible for building an important floodgate receives a strange new recruit: Hei-hai, a skinny, silent and almost feral boy. Assigned to assist the blacksmith at the worksite forge, Hei-hai proves superhumanly indifferent to pain or suffering and yet, eerily sensitive to the natural world. As the worksite becomes a backdrop...