The fight to free the Earth from alien domination began in Live Free or Die, and continued in Citadel. Now Tyler Vernon and his troops aboard the gigantic battle station Troy face a desperate battle with the forces of galactic tyranny. And the very survival of the Earth and its people is not all that is at stake. The galaxy itself must choose to live free...
After the success of his first assignment from the UNICORNE agency, fourteen-year-old Michael Malone is given another unexplained mystery to solve. When UNICORNE detect strange goings-on in a comic book shop, Michael is sent to investigate - a task which is made all the more difficult by allies he can no longer trust, and an enemy he can't actually see .