Robert Ludlum's The Bourne Sanction (Bourne Series #6)

Jason Bourne needs to regain his life as David Webb so he accepts an invitation from his beloved mentor, Dominic Specter, to join the linguistics department at Georgetown. It's a relief to leave the Bourne identity behind, but Jason soon finds himself in a life-or-death confrontation where every move might be his last.

Specter tells him that a former student and son of his old friend was killed by Muslim extremists known as the Eastern Brotherhood. Their leader is a man named Semian Icoupov,...