Decades ago, this city found a way to deal with the polarization of society and the housing crisis in one fell swoop: daylight belongs to those who value order and safety, while the nighttime is ruled by freedom and chaos. The only thing that daylighters and nighttimers share are their apartments. Halle lives a cushy daylight life as an architect until her bureau's latest project - the Diamond Shard Quarter - collapses. The catastrophe rips a hole into the neat order of day and night society.And when a personal calamity haunts her professional one, Halle may have to slip into the night and break the law.