A broken world. 
An overwhelming evil. 
A team of warriors ready to strike back.
#1 New York Times-bestselling author Marie Lu is back with an  adrenaline-laced novel about the lengths one warrior will go to fight for freedom and those she loves.
Talin is a Striker, a member of an elite fighting force that stands as  the last defense for the only free nation in the world: Mara.
A refugee, Talin knows firsthand the horrors of the Federation, a  world-dominating war machine responsible for destroying nation after nation with its terrifying army of mutant beasts known only as Ghosts.
But when a mysterious prisoner is brought from the front 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.  
Loyalty is life.