The Star Collector

Summary

Space-sheriff Joe Corbit has just stumbled upon the greatest artifact in the history of the universe. 
Too bad it's a threat to our very existence.
When a distress call leads Joe to the ruins of a lost, alien civilization, he finds an illegal archaeological dig underway. The Chinese Galactic Empire is working with the Martian mob to smuggle an artifact across state lines.
One deadly shoot-out later, and Joe finds himself in possession of the curious trinket. His plan is to auction it off to the highest bidder... that is, until he finds out why the Chinese were after it in the first place. They believe it to be an ancient super-weapon, a device that has already sent one intergalactic alien species into extinction.
Joe must fend off the powerful Chinese Space Fleet while trying to figure out how to deactivate the alien artifact. 
Otherwise... it will be our turn to go extinct.