Passage Trilogy Series by Justin Cronin

Summary:

The Passage Trilogy by Justin Cronin is a post-apocalyptic saga where a government experiment unleashes a deadly virus, creating vampire-like creatures called "virals." Humanity's survival hinges on Amy Harper Bellafonte, a mysterious girl who holds the key to stopping the plague.

The Passage
A government experiment goes wrong, unleashing a viral apocalypse, while Amy, an immune girl, may be humanity’s last hope.

The Twelve
Survivors uncover the origins of the virus and the truth about the powerful Twelve, leaders of the virals.

The City of Mirrors
The final battle between humanity and the virals decides the fate of the world as Amy faces her ultimate destiny.