Oddly, for a detective/thriller, the first half was better than the second. Chase scene through SF held up very well. Plot. Robert Vaughn is bringing some guy from Chicago to testify against the mob. The guy is supposed to be protected by Bullitt, but gets killed. Turns out it wasn't the right guy--the "right" guy is trying to beat it out of the country with millions. Robert Vaughn is evil because . . . not quite sure. Maybe because he doesn't care about justice but only about how justice improves his career. Anyway, B. kills the mob guys after the mob thief, then kills the mob thief, then returns to J. Bisset who implied she might leave him Steve McQueen was a non-actor. "Cool" is the positive description. Terrible might be the more accurate word.