Severance.
(Book)

Candace Chen is devoted to routine. She goes to work, troubleshoots the teen-targeted Gemstone Bible, watches movies in a Greenpoint basement with her boyfriend. Then Shen Fever spreads. Families flee. Companies cease operations. The subways screech to a halt. Her bosses enlist her as part of a dwindling skeleton crew with a big end-date payoff. Soon entirely alone, still unfevered, she photographs the eerie, abandoned city as the anonymous blogger NY Ghost. Enter a group of survivors. They're traveling to a place called the Facility, where they will have everything they need to start society anew.