Robert Ludlum's (TM) The Bourne Sanction

Jason Bourne, seeking a quiet life as a linguistics professor at Georgetown University, struggles with the mundanity of academia after years of danger. When his mentor urges him to investigate the assassination of a former student linked to a mysterious extremist group known as the Black Legion, Bourne is drawn back into a world of peril. As he delves deeper, he uncovers a lethal plot aimed at the United States, all while facing threats from both the CIA and a relentless assassin with a sinister agenda.