Save from Wrath: Extinction Protocol, Book standalone

On the besieged planet of Kepler 186f, a Marine platoon races against time to rescue civilians from an army of unstoppable Ghosts. Dropship pilot Justin Ceguerra is living through his own private hell, until the mission offers an unlikely chance of redemption.This short story is set in the universe of Extinction Protocol, a two-book hard science fiction series with a chilling twist, from New York Times bestselling author Felix R. Savage.