Passage: The Bourne Ultimatum is a 2007 action spy film directed by Paul Greengrass loosely based on the novel of the same name by Robert Ludlum.  The screenplay was written by Tony Gilroy, Scott Z. Burns and George Nolfi and based on a screen story of the novel by Gilroy.  The Bourne Ultimatum is the third in the Jason Bourne film series, being preceded by The Bourne Identity (2002) and The Bourne Supremacy (2004). The fourth film, The Bourne Legacy, was released in August 2012, without the involvement of Damon, and the fifth film (a direct sequel to Ultimatum), Jason Bourne, was released in July 2016.

Question: What was the story of Jason Bourne based on?
the novel of the same name by Robert Ludlum