The Lazarus Men — Christian Warren Freed

It is the 23rd century. Humankind has reached the stars, building a tentative empire across a score of worlds. Earth's central government rules weakly as several worlds continue their efforts toward independence. Shadow organizations hide in the midst of the political infighting. Their manifestations of power and influence are beholden only to the highest bidder. The most powerful/insidious/secret of these, The Lazarus Men, has existed for decades, always working outside of morality's constraints. Led by the enigmatic Mr. Shine, their agents are hand selected from the worst humanity has to offer and available for the right price.
Gerald LaPlant lives an ordinary life on Old Earth. That life is thrown into turmoil on the night he stumbles upon the murder of what appears to be a street thief. Fleeing into the night, Gerald finds himself caught in a war between the Lazarus Men and Roland McMasters, an extremely powerful man dissatisfied with the current regime and with designs on ruling his own empire.