In the future, instead of evolving into a red giant, the sun mysteriously disappears. A civilization reliant upon the sun is plagued by apocalyptic consequences. In a failing electric car, Yang, a reclusive astronomer, and Mu, his bubbly neighbor, escape the warm and comfortable lifestyle of District One. Temperature falls to subzero degrees in District Two, a ghost city with standstill windmills. Oxygen depletes in District Three, as they grapple with a gang of brainwashed coal miners. Yang and Mu gravitate forward, in search of light in the perpetual darkness—their only hope lies in a miracle waiting for them at their final destination, District Four.
