*MAY CONTAIN SPOILERS*

The novel follows David Webb, alias Jason Bourne, as he works to find his old enemy, Carlos the Jackal, who is trying to kill him. As the Jackal enters old age and his infamy fades, he decides that he will do two things before he dies: kill Webb/Bourne, and destroy the KGB facility of Novgorod, where the Jackal was trained and later turned away. Carlos the Jackal uses a diverse collective of aged men devoted to his handiwork and known as "The Old Men of Paris." Webb sends his wife and children to live with his wife's brother, John St. Jacques, in the Caribbean for protection while Webb himself works with old friend and CIA agent Alexander Conklin, and to a limited degree, the CIA, to hunt down and kill the Jackal first. Webb poses as an important member of Medusa (a newer version than the original he was associated with during the Vietnam era) (see Jason Bourne), now a nearly omnipotent economic force that controls the head of NATO, leading figures in the Defense Department, portions of the American and Sicilian mafia, and large NYSE firms. The plan is to use Medusa's resources to contact the Jackal. Webb just misses the Jackal several times, including when the Jackal locates Webb's family in the Caribbean, before Webb stages his own death and convinces the Jackal that he has succeeded. Following this, the Jackal turns to his second goal, to destroy the Novgorod, a large Russian installation used as training ground for KGB candidates. It contains different areas, each simulating a different Western environment. Webb tracks the Jackal down with the help of Conklin and a KGB agent named Dimitri Krupin as the Jackal begins destroying the KGB compound. In a final confrontation, the Jackal is finally killed and Webb returns to his family...

source-wikipedia