An all guts, no glory San Francisco cop becomes determined to find the underworld kingpin that killed the witness in his protection.

Cathy: What will happen to us, in time?
Bullitt: Time starts now.
Walter Chalmers: Frank, we must all compromise.
Bullitt: Bullshit.
Bullitt: You sell whatever you want, but don't sell it here tonight.
[after much patient pressure, the desk clerk has finally offered up some details]
Desk Clerk: Am I helping you, sir?
Delgetti: I never had it so good.
Walter Chalmers: Come on, now. Don't be naive, Lieutenant. We both know how careers are made. Integrity is something you sell the public.
Bullitt: Look, Chalmers, let's understand each other... I don't like you.
Captain Bennett: He let the killers in himself? Why would he do a thing like that?
Frank Bullitt: I'm waiting to ask him.
Captain Bennett: What about the setup? What do you make of that?
Frank Bullitt: Shotgun and a backup man, professionals.
Cathy: You're living in a sewer, Frank. Day after day.
Walter Chalmers: Lieutenant, don't try to evade the responsibility. In your... parlance, you blew it. You knew the significance of his testimony, yet you failed to take adequate measures to protect him. So to you, it was a job, no more. Were it more, and you had the dedication I was led to believe...
Bullitt: You believe what you want. You work your side of the street, and I'll work mine.
[Bullitt and Delgetti have searched the luggage of Dorothy Simmons and her boyfriend]
Delgetti: No passports, no tickets.
Bullitt: Call Immigration in Chicago, have them wire Rennick's passport application, I'll get a fingerprint check on Ross.
Captain Bennett: Albert Edward Rennick, used car salesman, Chicago.
Walter Chalmers: Who's Rennick?
Frank Bullitt: He was the man who was shot at the Hotel Daniels. You sent us to guard the wrong man, Mr. Chalmers.
Bullitt: Who else knew where he was?
Walter Chalmers: What?
Bullitt: Who else knew where he was?
Walter Chalmers: What are you implying?
Bullitt: Well, they knew where to look for him, and they used your name to get in.
Walter Chalmers: Are you suggesting I disclosed his whereabouts?
Bullitt: Well, somebody did. And it didn't come from us.
Bullitt: [revealing Johnny Ross' death] I've got him downstairs, under a John Doe.
Baker: [stunned] You are sick. Smuggling a dead man out of a hospital, and now two men killed who may have had nothing to do with it?
Bullitt: The man I was chasing killed Ross.
Captain Bennett: How do you know? Did you see him?
Bullitt: Yes. He tried to nail me with a shotgun, a Winchester pump.
Baker: The radio report said the two men were burned beyond recognition. Now all he's got are two dead men. It would never hold up in court.
Walter Chalmers: I do not choose to have people accuse me of false promises for the sake of cheap sensationalism, or to be compromised by your lieutenant.
Pete Ross: This is Pete. We lost him.
telephone voice: He's your brother, Ross. If you can't find him, we have people who can. And YOU'RE paying for the contract.