After the World Ends: Save (Book 4). After The World Ends, #4

From New York Times and USA Today bestselling author Jamie Thornton. DESSA IS RUNNING OUT OF TIME. The side effects from the zombie-blocker meds have become too great to bear, and so Dessa and her friends must bring all the Project Polus children to a special government facility called Sanctuary to get them help. But when rogue soldiers attack, the group is split. Now, in order to reach Sanctuary in time, Dessa and her companions must brave the dangers of almost a hundred miles of swampy river.
Unfortunately, zombies can swim. ********For readers who love Young Adult apocalyptse fiction with: Survival at any cost High-stakes missions A band of outsiders Found family Fast zombies Zombies with a big twist Race against the clock Corrupt authority figures A government conspiracy Humor as a coping mechanism Romance during the apocalypse Tough choices with no right answer Doing the wrong thing for the right reason Villains who think they're right Loyalty tested to the breaking point Redemption arcs Love vs.
duty Protecting someone who doesn't want saving Makeshift weapons and scavenged survival Teen rebels vs. the system Secrets that could save-or doom-what's left of the world Hope in the ruins Laughter in the dark When saving the world means burning it down