Through the Ever Night is the second in the Under the Never Sky trilogy.
In Under the Never Sky, Aria lived in an enclosed city due to electrical energy storms that are slowly growing worse. Perry is a savage Outsider. When Aria is kicked out of her home, she and Perry meet. It was a lot of action and I loved it.
Through the Ever Night continues the story of the Outsiders trying to survive an increasingly hostile environment. It was a lot of action and I loved it.
I hope Into the Still Blue will be full of action and that I'll love it just as much as its two predecessors. I should be getting the book within the week. Crossing my fingers that the final book in the trilogy won't disappoint.