Just what, exactly, do humans know of outer space? For generations now, we have studied about planets and solar systems, but have yet to learn "if there is really life beyond the Earth." Just two years after the avian flu swept away half of the Earth's population, visitors from outer space contact Earth bring dire news of an advanced alien race set on destroying everything in its path, where Earth just happens to be conveniently located. Racing against time it is up to men and woman of "a certain state of mind" to be technologically enhanced and sent forth to attempt the impossible; slow the Shenkar invasion fleet down to give Earth time to build up it's defenses. Join Liam Brennan, Evan Maxis and the rest of the EDF Sacrifice as they go forth. These men and woman have nothing to lose, but can they hold off the Shenkar's destructive wrath long enough for the Earth to enhance it's defenses? The job is nothing short of a sacrifice, but the fate of all mankind rests on them.