Builltt is terrific, good adaption of the book "Mute Witness. Terrific film. What I like about it is that it takes its time telling you the story, and is slow moving, with exception, of course, of the car chase. The film can be confusing, but I feel that was intended. The pace at which the story unfolds is the pace in which Bullitt is thinking to try to capture the killer. I take exception that we don't know why the witness was killed. It is spelled out towards the end. As to the criticisms regarding more info was needed about the hows and whys of the mob, I find that silly. Its the mafia, there was someone stealing from within, and they wanted him rubbed out. Also some critique Jacquline Bisset's dialogue. We need to remember that this film was made in 1969, with a very different collective conscience of peace and non-violence than exists today. The film was reflecting the values of the time with her character, and trying to appeal to a younger audience. That being said, the book the film is based on is quite different. First the action takes place in NYC instead of San Francisco. The character of Bullitt is named "Clancy" and he is the typical Irish cop grizzled and jaded with a beat up car. The film transforms him to a hip, cool, tidy detective. The plotline is a little more complicated. Johnny Ross's brother is the one who shoots the look alike fake, Albert Renick, not hitmen. The corrupt brothers cooked up the scheme after meeting Renicks wife, who was a manicurist in a exclusive LA hotel. The manicurist mentioned to Johnny Ross the her husband looked so much like him. The brothers approached Renick's husband and made an offer for him to take the place of Johnny Ross and spring him from the hotel, or the wife would be disfigured. The other Ross would return to LA, and Johnny was going to Europe on a ship with Renicks passport. The finale takes place in a New York dock, and Johnny is arrested, not killed.