On the day Xu Chuan is most desperate for money, a dead man sends him a delivery order worth 100,000 yuan. The destination is an old hospital building that was demolished long ago. Yet from inside the black insulated delivery box comes the voice of his sister as a little girl.
The first order is delivered, and the money really does arrive. His sister's condition also temporarily stabilizes. Xu Chuan gains the ability to see the most likely fatal path a target will take over the next three minutes. But right after that, a new interface orders him to kill himself before midnight.
Xu Chuan begins to understand that orders can be tampered with, and navigation can lead people to their deaths. A missing girl's backpack, a badge in a burning building, and the last bus, long since taken out of service, lead him to routes erased from the city. By the time he discovers that his sister was registered as "dead" long ago, his father, missing for eight years, has also reappeared in the handover records at the end of the route.
