The Sa'Nerra have breached Fleet's front-line and are pushing toward Earth with an invasion armada. In its vanguard is the super-weapon known simply as Titan - a ten-kilometer-long battleship capable of destruction on a scale never seen before.

With G-sector already surrendered to the enemy, Fleet reforms and prepares to guard the only interstellar aperture that links the colonies to Earth. But Captain Lucas Sterling knows that without a way to counter the Sa'Nerran neural control weapon, there is no way to stop the alien warriors from pushing deeper into Fleet space.

With the alien invasion armada poised to cut off access to the Void, Captain Sterling and the crew of the Invictus must go against their orders and once again venture into this stellar no-man's land alone.

Sterling knows that disgraced and exiled Fleet scientist, James Colicos, may be humanity's only hope to stop the invasion. But in order to find him, the Invictus has to venture beyond the Void and into Sa'Nerran space itself.
The last time a Fleet ship burrowed too deeply into the aliens' territory, it started a war. Now, Captain Sterling and his Omega officers must violate the enemy's heartland once again.

Except this time, Sterling is not looking to start a war - he is trying to end one.