Archangel — Margaret Fortune

It's been over a year since New Sol Station went up in a blaze of light to reveal the Spectres, an incorporeal alien race bent on humanity's destruction. As a soldier in the Celestial Guard, Michael Sorenson is on the frontlines of the war, evacuating hot zones and quarantining infected colonies. When he distinguishes himself during a mission, he is recruited into Division 7, a top secret R&D base run by the enigmatic Dr. Daedalus Angelou. Here Michael joins the Testing Division, where he and his team must make dangerous runs into enemy-held territory in order to test out new weapons prototypes on their incorporeal enemy.

Not all enemies are invisible though. A saboteur is loose in R&D, and he has his sights set squarely on the Archangel, a massive weapons system capable of destroying the enemy en masse. When the saboteur tries to frame Michael for the crime, he realizes it's up to him to hunt them down. But while Michael searches for the saboteur within, outside the enemy is closing in. All signs point to a massive Spectre offensive brewing on the horizon, and though no one knows when or where it will strike, they do know the Archangel could be the only thing standing between victory and annihilation. As the clock ticks down toward the inevitable confrontation, Michael races to find the saboteur before it's too late.