Frank Sinatra is the assassin who has the murder of the century planned out to the minute.
Sterling Hayden is the local cop who is the fly in the ointment.

Fun fact: Sinatra would go on to play the foiler of an assassination plot in "The Manchurian Candidate," and Hayden would go on to play a corrupt cop who was part of an assassination plot in "The Godfather."

Enjoy!