Fatal Blow. The Chronicle of the Final Light, #6

Overcoming impossible odds requires terrible sacrifice. With enemies threatening the human species from every side, the Kedraalian Republic staggers ever closer to its end. It's up to heroes such as Marine Avery Shetty to lead the struggle to stave off complete collapse. But when desperate plans take Shetty and his comrades back to Kedraalian space, they discover their home world is already in the grip of a new enemy.
Intelligent machines rule the human worlds in all but name, and the battered fleet recently escaped from the Ferekon front has no hope against the dangers awaiting it. But this bleak outlook won't prevent the military and civilian resistance from leading a strike they hope might reverse their doomed course, landing a fatal blow against an unstoppable enemy. In this action-packed military science fiction and galaxy-spanning space opera hybrid, the thrills will keep you on the edge of your seat.
Be sure to pick up Fatal Blow, book six in The Chronicle of the Final Light series.