Star-Eater Chronicles 4. Foundation's End.... Star-Eater Chronicles, #3

Seth Gingko has the fastest human-owned ship in the home galaxy. It has been pimped/souped up by plant hybrid cyborg aliens, and is invaluable to Seth's old employers, the MacCollie Company. But Seth has a problem. Through a technicality, he's out of contract, and he's stolen the ship. But he knows he has get back to Earth with the information he's gained.Aliens are invading the galaxy. And there Seth has another problem.
The Human races so far have not yet met any alien life in the galaxy. He's tried to tell the heads of the Fellowship and the large MacCollie Corporation of his fears, but it seems they might be in league with the aliens. For a reason unknown to Seth, they're keeping the alien's existence secret from the Fellowship population. Seth has just one mission. He has to inform humanity of the existence of aliens.
even if it means an inter-planetary war. He needs more men, more ships. Not an easy task when somewhere in his little cadre, there's a traitor.