In the first book, The Bourne Identity, the title character suffers amnesia. Over the course of the book, he regains his memory with the help of a Canadian economist, Marie, and eventually finds that his real name was Webb. He had previously been an operative of the Central Intelligence Agency in an elite project in Southeast Asia and Vietnam codenamed Medusa. Following the American forces' withdrawal from Vietnam, he joined Project Treadstone 71, where he was used as bait for the infamous European assassin Carlos the Jackal, and assumed the identity of a mock assassin, Jason Bourne. “Bourne" took credit for various kills in China and the rest of Asia, acting as a rival to the Jackal, in order to draw him out of hiding.