Pink. Orange. White. Indigo. In the ruthless and unforgiving world of mercenaries, these are the code names of an elite group of assassins, known collectively as the Black Cross. They leave behind no DNA, no evidence at all--and until they were recruited by the shadowy group, they were the best and deadliest operatives working for the U.S. government. When someone begins targeting retired American servicemen--CIA, navy and marines--Stony Man decides...