In a dark future, when North America has split into two warring nations, fifteen-year-old Day--a famous criminal, and prodigy June--the brilliant soldier hired to capture him, discover that they have a common enemy.

The Karensa Federation has conquered a dozen countries, leaving Mara as one of the last free nations in the world. Refugees flee to its borders to escape a fate worse than death, transformation into mutant war beasts known as Ghosts, creatures the Federation then sends to attack Mara. The legendary Strikers, Mara's elite fighting force, are trained to stop these monsters. But as the number of Ghosts grows and Karensa closes in, defeat seems inevitable....