Centuries after their defeat, the enemy has returned with an overwhelming attack on the fringes of human space. On the brink of annihilation, humankind's only hope is a few brave souls who survived the initial onslaught: Commander Lucinda Hardy, thrust into uncertain command of the Royal Armadalen Navy's only surviving warship; Booker3, a soldier of Earth, sentenced to die for treason, whose time on Death Row is cut short by the invasion; Alessia, a young royal of the Montanblanc Corporation, forced to flee when her home planet is overrun and her entire family executed; Sephina L'trel, the leader of an outlaw band who must call on all of their criminal skills to resist the invasion.

And, finally, retired Admiral Frazer McLennan, the infamous hero of the first war with the Sturm hundreds of years ago, who hopes to rout his old foes once and for all - or die trying.

These five flawed, reluctant heroes must band together to prevail against a relentless enemy and near-impossible odds. For if they fail, the future itself is doomed.