The Bourne Supremacy

In the first book, The Bourne Identity, Jason Bourne had suffered amnesia. Over the course of the book he regained his memory with the help of a Canadian economist, Marie St. Jacques, and later found that he was previously a special operative for the United States Government in an elite project in Southeast Asia and Vietnam codenamed Medusa. After a tragic accident involving the death of his family, he joined Project Treadstone Seventy-One, where he was given the code name of Cain and used as bait for the infamous European assassin, Carlos. Bourne took credit for various kills in China and the rest of Asia, acting as a rival to Carlos, in order to draw him out of hiding and into the hands of the U.S. Government. In a climactic scene at the end of the book, Carlos escaped and Bourne was almost killed as he was believed to be a traitor by his uninformed employers.