From New York Times and USA Today bestselling author Jamie Thornton.A surprise mutiny.Dessa and her friends reach the safety of the surface, mourning the death of one of their own, only to discover everything has changed. Old alliances have failed and more than half of Sanctuary's staff mutiny—they will do whatever it takes to wrest control of Sanctuary from the scientists.Sanctuary is fighting a civil war, but the kids from Project Polus are trapped deep underground with Super V's on the loose and on the hunt.Dessa and her friends must risk it all to raid Sanctuary, save the kids, and make their home safe again. But what if Sanctuary can't be saved?For readers who love Young Adult apocalypse books with heart and: 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