The Saints (Quarantine #2)

Nothing was worse than being locked in—until they opened the door...

McKinley High has been a battle ground for eighteen months since a virus outbreak led to a military quarantine of the school. When the doors finally open, Will and Lucy will think their nightmare is finished. But they are gravely mistaken.

As a new group of teens enters the school and gains popularity, Will and Lucy join new gangs. An epic party on the quad full of real food and drinks, where kids hookup and actually interact with members of other gangs seemed to signal a new, easier existence. Soom after though, the world inside McKinley takes a startling turn for the worse, and Will and Lucy will have to fight harder than ever to survive.