Holiday Gift Bundle #3: Sovereign Stars Paperbacks 1 - 4

The first four Soveriegn Stars Science Fiction Books in paperback bundled together.
NOT AN OMNIBUS
Each book is 1 paperback. 

You get 4 separate paperbacks
Avenger, Gods of War, Armored Fleet, and The Enemy Within

From Book One: 

Five years after physicist Mark Holder discovered the Slipstream Drive in 2058, humanity reached for the stars and began to colonize the galaxy. For centuries, humans continued to populate system after system without encountering intelligent alien life.

Some twelve hundred years later, after many generations of relative peace, in the year 3278, human space is invaded by a powerful and mysterious enemy. To these invaders the very concept of free will is heresy. Their crusade—to eradicate humanity.

The war begins, and the fight for the survival of the human race is on.