The First Imperium

In Book 4 of the Crimson World Series, the Alliance and its colonies, having recently signed a truce, prepare for an inevitable confrontation while an ancient, automated threat awakened from Epsilon Eridani IV endangers humanity's survival. As Erik Cain and his Marines gear up for what could be their final battle against the formidable robotic legions of the First Imperium, they must navigate not only new enemies but also the challenge of forging alliances with former foes.