The aliens took her ship. Commander Halsey wants it back.For decades they were among us, silently infiltrating the power structures of society. Now the Swarm stands on Earth's doorstep. As humanity launches a desperate counter-attack, the alien victory seems inevitable.For Halsey, this is personal. While the Fleet executes their battle plan, she leads a do-or-die suicide strike at the heart of the alien force: her own Invincible, turned into a weapon...