The race to the Still Blue has reached a stalemate. Aria and Perry are determined to find this last safe haven from the Aether storms before Sable and Hess do—and they are just as determined to stay together. Within the confines of a cave they're using as a makeshift refuge, they struggle to reconcile their people, Dwellers and Outsiders, who are united only in their hatred of their desperate situation. Meanwhile, time is running out to rescue Cinder, who was abducted by Hess and Sable for his unique abilities. Then Roar arrives in a grief-stricken fury, endangering all with his need for revenge. Out of options, Perry and Aria assemble an unlikely team for an impossible rescue mission. Cinder isn't just the key to unlocking the Still Blue and their only hope for survival—he's also their friend. And in a dying world, the bonds between people are what matter most. In this final book in her earth-shattering Under the Never Sky trilogy, Veronica Rossi raises the stakes to their absolute limit and brings her epic love story to an unforgettable close.