There are 3 books in the Under the Never Sky series. The newest book is Into the Still Blue which came out in 2014.

1
Under the Never Sky

Book cover of Under the Never Sky
WORLDS KEPT THEM APART. DESTINY BROUGHT THEM TOGETHER. Aria has lived her whole life in the protected dome of Reverie. Her entire world confined to its spaces, she's never thought to dream of what lies beyond its doors. So when her mother goes missing, Aria knows her chances of surviving…
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2
Through the Ever Night

Book cover of Through the Ever Night

Aria has struggled to build a life for herself outside Reverie. It hasn't be easy adjusting to life in the wilderness but the struggle has been worth it with Perry by her side.

But Perry has other challenges. His people are looking to him for answers. Answers about what happened…

3
Into the Still Blue

Book cover of Into the Still Blue
Worlds kept them apart. Destiny brought them together. Outside the dome of Reverie, Aria and Perry are struggling to keep their people from tearing each other apart. Their situation is desperate, and with the Aether storms worsening time is running out for them to rescue Cinder from Hess and Sable.…