Stone Chalmers: The Complete Science Fiction Secret Agent Series. Stone Chalmers

One man can make-or break-Earth's iron grip on its galactic colonies: Stone Chalmers. Spy. Assassin. Earth's top operative. Stone's missions take him through artificial wormholes and on warpdrive ships to colonies bound to Earth-whether the like it or not. Though undercover, with cover personas overlaid on his mind and disguises engineered by nanotechnology into his bones and his cells, Stone's missions are never easy.
In the eye of a storm of intrigue and conspiracy, Stone's actions make the difference in whether open rebellion threatens the galactic order imposed by Earth..and threatens Earth itself. Join Stone on his pulse-pounding adventures across a galaxy spiraling out of control, in this complete four-novel series.