I read all three in the trilogy: Under the Never Sky, Through the Ever Night, and Into the Still Blue. It is young adult but I still felt like the characters were in their world and not too teen-like nor too adult-like.
Earth has been ravished by electromagnetic fields. 300 years ago the rest of civilization dispersed into the world or into 'pods', aka with technology. The magnetic fields caused enhanced mutations for the outsiders while the dwellers became addicted to technology.
Aria is a dweller who comes into contact with Perry, and outsider when they meet during a fire in her pod.
The two set out together to find the people they love, her mom and his nephew.
It's a nice love story. They really hate each other for along time and we see their relationship blossom and grow over time. There are no love-triangles, thank goodness. I hate those. Just some jealousies and misunderstandings.
All three novels focus on their relationship and the relationships they form with those around them. The ultimate goal is to make it to paradise or "The Still Blue", a spot where the magnetic fields have created a bubble with blue skies and drinkable water.
It's a great story on love, loyalty, friendship, and loss. I would recommend it for anyone.