Jason Bourne returns to Georgetown University and the mild world of his alter ego, David Webb, hoping for normalcy. But after so many adrenaline-soaked years of risking his life, Bourne finds himself chafing under the quiet life of a linguistics professor. Aware of his frustrations, his academic mentor, Professor Specter, asks for help investigating the murder of a former student by a previously unknown Muslim extremist sect, The Black Legion. Bourne's investigation into the Black Legion turns into one of the deadliest and most tangled operations of his double life-the pursuit of the leader of a murderous terrorist group with roots in the darkest days of World War II-all while an assassin as brilliant and damaged as himself is getting closer by the minute.