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....

"When the space station Heimdall is invaded, Hannah and Nik must work together to defeat the enemy"--