Created by ancient aliens in a daring gambit to understand the nature of the enemy, humanity is now asked to be the savior of a universe not their own.
ThriftBooks sells millions of used books at the lowest everyday prices. We personally assess every book's quality and offer rare, out-of-print treasures. We deliver the joy of reading in recyclable packaging with free standard shipping on US orders over $15. ThriftBooks.com. Read more. Spend less.