The Bourne Identity is the rare tent pole trilogy. It generated three films that set the high bar for the espionage genre, despite rampant creative clashes that go back to the first film, which was started by Doug Liman and finished by producer Frank Marshall. Key to the construction of Bourne’s complex mythology all along has been Tony Gilroy, who stripped away most of Robert Ludlum dense original book and boiled it down to an amnesiac assassin’s challenge to rediscover his identity and humanity.