Hostile Takeover — Jack McKinney

The Black Hole Travel Agency held Earth in its grasp--it was on the way to turning the planet into nothing more than an alien tourist attraction. Although there were three crusaders who would fight to the death before it was completed. Meanwhile, elsewhere in the galaxy, an all-out assault on Black Hole was in the works. The personnel: rebel insurgents of all species. The place: Light Trap, the Agency's Dysonsphere stronghold. The time: Now or never!