Bullitt

Bullitt is a 1968 American crime action thriller film. Frank Bullitt, a police detective who works for the San Francisco Police Department, is assigned to protect a witness for 40 hours, issued by the ambitious politician, Walter Chambers.

Before the night is over,two hit men break into the witness's room and kills him and wounded a police officer. Knowing this, Bullitt gather up information about the incident and opens up a investigation on his own after his police captain gives him the permission to investigate the crime.