Elysium

What you do when your blood can save another? Only, a few pints aren't enough. Years ago, a demonic strain of the Black Death gripped the continents in terror. Nothing could stop it. It was renamed Red in its early stages. Red for blood.
That's what it all comes down to: blood. In Eliza Morgan lives the cure--but there's a price. It takes all of it. Eliza discovered that as she watched her mother die, when a small amount fell from an open cut onto her mother's blackened skin. The effect was only momentary.
Nine years later, men in black suits come to her house, throw a bag over her head, and toss her in the back of a van.
When Eliza wakes, there's nothing but concrete and prison bars. Her secret is out, and before long she might die for it. There is, however, a rumor--a rumor of an elusive haven. No one finds it--it finds them.
And for whatever reason, it wants very badly to find Eliza.