Outcome — Edward W. Robertson

Ellie Colson is the only one who believes in the end of the world.

As an agent of the Department of Advance Analysis, she's one of a handful of people who knows about the spread of a new virus -- one she believes will wipe out mankind. WIth her bosses in denial, she flies to New York to get her ex-fiance Chip to safety.

But he's already been scooped up and quarantined -- and so has his adopted daughter. Pursued by her own agency, Ellie will stop at nothing to break Chip out before the virus claims them all.
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Outcome is a prequel novella to the Breakers series. It's best to read it before book three.