Stargate SG-1, book 10 : Relativity
James Swallow2007

Future Imperfect...
When SG-1 encounter the Pack - a nomadic space-faring people who have fled Goa'uld domination for generations - it seems as though a trade of technologies will benefit both sides.
But someone is determined to derail the deal. With the SGC under attack, and Vice President Kinsey breathing down their necks, it's up to Colonel Jack O'Neill and his team to uncover the saboteur and save the fledgling alliance. But unbeknownst to SG-1 there are far greater forces at work - a calculating revenge that spans decades, and a desperate gambit to prevent a cataclysm of epic proportions.
When the identity of the saboteur is revealed, O'Neill is faced with a horrifying truth and is forced into an unlikely alliance in order to fight for Earth's future...