A wormhole stands between humanity and an alien evil in this sci-fi thriller from the New York Times-bestselling author of Star Corps.When called to do battle many light years from home, the 1st Marine Interstellar Expeditionary Unit rose to the challenge-and now thousands of enslaved humans have been freed from the alien yoke. But Earth is twenty-one years older than the home planet they originally left, and the Marines need time to retrain and readjust-time they do not have, due to the bizarre disappearance of a detachment of their brothers- and sisters-in-arms. It is a mystery, but there is a starting point: an ancient wormhole threading through the Sirius system. Whatever waits on the other side must be confronted, with stealth, with force, and without fear-be it an ancient enemy or a devastating new threat.The Marines are heading into the perilous unknown . . . and what transpires there could reshape the universe for millennia to come."As always, Ian Douglas (William H. Keith, Jr.) writes thrilling, heroic space battles with fascinating and credible use of technology." -Book Loons