Back Blast (Gray Man 5) by Mark Greaney
New mass market paperback (cover may vary).
Five years ago, Court Gentry was the CIA's best covert asset. Then, without warning, his masters at the Agency put him at the top of their kill list. Court fled his country and became an enigmatic killer for hire known as the Gray Man.
Determined to find out what made the Agency turn against him, he plans to get his hands on the men who sent him on his last mission, Operation BACK BLAST. What he doesn't realize is that the questions that arose from his time as an American assassin are still reverberating in the U.S. intelligence community, and he's stumbled onto a secret that powerful people want kept under wraps.
The result: everyone has Court in their crosshairs.