Skyhunter

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Skyhunter by Marie Lu

Text from the back cover:

Talin is a Striker, a member of an elite fighting force that stands as the last defense for Mara, the only free nation in the world. Talin knows firsthand the horrors of the Karensa Federation, a world-dominating war machine responsible for destroying nations with its terrifying army of mutant beasts known only as Ghosts. When a mysterious prisoner is brought to Mara's capital, Talin senses there's more to him than meets the eye. Is he a spy from the Federation? What secrets is he hiding? Only one thing is clear: Talin is ready to fight to the death alongside her fellow Strikers for the only homeland she has left, with or without the boy who might just be the weapon to save -- or destroy -- them all.

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Ms. Sharp's quick review: Insane action!