The Drakuls have found the Solar System

A merciless race, there is nothing left once the Drakuls have conquered a civilization except the bones of its dead. When the first Drakul exploratory ship emerged from the stargate, Earth's days became numbered.

Although LCDR Shawn 'Calvin' Hobbs and the crew of the TSS Vella Gulf came back with a battleship from their last mission, it won't be enough to defend the Solar System from the Drakul menace. The Mrowry and the Terran artificial intelligences have run the numbers...and Terra has come up wanting.

The crew of the Vella Gulf knows what a Drakul invasion means: the end of civilization as we know it. Can they find a way to stop the devastating onslaught of the Drakul fleet? Even their new allies, the Mrowry, think Earth's salvation is unlikely. The Earth has more enemies than it can count and no prospect of aid. In the face of extinction, Terra Stands Alone