A mysterious virus. The infected's erratic behavior. A world descending into chaos.

It began with a top-secret government summons.
Destination: Classified
Dr. Sloan Egan doesn't understand why she's required to attend the top-secret retreat. She's a doctor, not a soldier. But under the threat of court-martial, she has little say in the matter.
Major Lee Archer isn't one to question orders. But to use a group of intellects instead of government personnel to test the validity of The Bunker...why risk the exposure?
Then the door of The Bunker is sealed.
Those inside are left with no way out.
The world they know, gone.
Uninhabitable.
Or so they've been told.
Beyond The Bunker, a secret lies in wait.
If it finds a way in, it could eradicate what's left of humanity.
And make no mistake.

It always finds a way in.