Starring Sterling Hayden and Frank Sinatra, Suddenly is set in a small town (also called Suddenly) out west. Sheriff Tod Shaw (Hayden) gets word that the president of the United States is coming into town on the train. John Baron (Sinatra) and his cohorts are planning to assassinate the president. They take over a widow’s house. It’s very tense. I strongly recommend Suddenly – it keeps you on your toes throughout the whole movie.
An interesting side note: Suddenly came out about eight years before The Manchurian Candidate where Frank Sinatra is trying to prevent an assassination.