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The Fifth Wave by Rick Yancey
After the 1st wave, only darkness remains. After the 2nd, only the lucky escape. And after the 3rd, only the unlucky survive. After the 4th wave, only one rule applies: trust no one.
Now, it’s the dawn of the 5th wave, and on a lonely stretch of highway, Cassie runs from Them. The beings who only look human, who roam the countryside killing anyone they see. Who have scattered Earth’s last survivors. To stay alone is to stay alive, Cassie believes, until she meets Evan Walker. Beguiling and mysterious, Evan Walker may be Cassie’s only hope for rescuing her brother—or even saving herself. But Cassie must choose: between trust and despair, between defiance and surrender, between life and death. To give up or to get up.
The Program by Suzanne Young
Sloane knows better than to cry in front of anyone. With suicide now an international epidemic, one outburst could land her in The Program, the only proven course of treatment. Sloane’s parents have already lost one child; Sloane knows they’ll do anything to keep her alive. She also knows that everyone who’s been through The Program returns as a blank slate. Because their depression is gone—but so are their memories.
Under constant surveillance at home and at school, Sloane puts on a brave face and keeps her feelings buried as deep as she can. The only person Sloane can be herself with is James. He’s promised to keep them both safe and out of treatment, and Sloane knows their love is strong enough to withstand anything. But despite the promises they made to each other, it’s getting harder to hide the truth. They are both growing weaker. Depression is setting in. And The Program is coming for them.
Reboot by Amy Tintera
Five years ago, Wren Connolly was shot three times in the chest. After 178 minutes she came back as a Reboot: stronger, faster, able to heal, and less emotional. The longer Reboots are dead, the less human they are when they return. Wren 178 is the deadliest Reboot in the Republic of Texas. Now seventeen years old, she serves as a soldier for HARC (Human Advancement and Repopulation Corporation).
Wren’s favorite part of the job is training new Reboots, but her latest newbie is the worst she’s ever seen. As a 22, Callum Reyes is practically human. His reflexes are too slow, he’s always asking questions, and his ever-present smile is freaking her out. Yet there’s something about him she can’t ignore. When Callum refuses to follow an order, Wren is given one last chance to get him in line—or she’ll have to eliminate him. Wren has never disobeyed before and knows if she does, she’ll be eliminated, too. But she has also never felt as alive as she does around Callum.
The perfect soldier is done taking orders.
I second all of these!