CHECKMATE In Checkmate, critically acclaimed novelist Steven James offers a climactic chapter in his bestselling series, the Bowers Files.     When a clandestine FBI facility is attacked, Special Agent Patrick Bowers is drawn into the vicious, ruthless story that a killer from his past is bent on telling the world.     Clues lead to long-forgotten secrets buried deep beneath Uptown Charlotte, North Carolina. Now Bowers is caught up in trying to stop one of the deadliest attacks ever planned on American soil.     Smart, tense, and full of mind-bending twists and turns, Checkmate explodes onto the scene, bringing this cycle of the Bowers Files to an unforgettable conclusion.