City Stories editor Jiang Ye moved into an apartment without a seventeenth floor. In the early hours of the third night, the elevator stopped once at 0:17; the next day, a package with the name of his missing mother appeared in the express locker. The delivery address is Room 1701 which does not exist at all. Everyone in the building told him that no one had ever lived on the seventeenth floor. But he knew that his mother disappeared on that floor.