Patrick Hodges 
Pawns [EPUB ebook] 

The future of the human race hangs in the balance. A powerful alien race called the Jegg has invaded Earth, wiping out half of the Terran Confederation.
In a hidden base under the Sahara Desert, a team of scientists works to mount a resistance against the invaders. Fitting a spacecraft with folding-space technology, they plan to travel to the other side of the galaxy to find a mysterious energy source that could help them defeat the Jegg.
But none of them are ready for what they will find on the distant planet.