Asgard's Conquerors: The Asgard Trilogy, Book Two

Asgard's not an easy world to get away from. Mike Rousseau only wants to take a vacation in his home system, but he's back before he has time to draw breath, and he's been drafted into the Space Force once again. His new mission is even more dangerous than the last one, the number of his enemies has increased vastly, and his friends haven't improved at all. By way of compensation, he has another chance to get closer to the mystery at Asgard's heart--but the inhabitants of the megaplanet's c...