The white-haired old man's activities with Russian politicians surfaced.
In order to cover up the truth, find Bourne as a scapegoat.
The blame, the pursuit, led to the murder of Bourne's lover, Mary.
Byrne had to find the source in order to protect himself.
With the involvement of the FBI, the clues became more and more clear, until the white-haired old man committed suicide and the Russian politician was arrested.
However, the final suspense of the film. It was Byrne and the female director of the FBI. He called her while he was monitoring, and finally said: You look tired, take a rest early.
That means he has his next move. And this matter is not completely over. The director of the FBI asked him to bring him back to investigate the matter thoroughly. The FBI must also find out the shady secrets in the plan of Stepping on the Stone, including every participant. Byrne is the most Key figures, bear the brunt.
Could this be the development of the third part? Just a personal guess, I will comment after reading the next one.
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