Suddenly (1954) Frank Sinatra and Sterling Hayden

A train carrying the president of the United States is scheduled to make a stop in the small town of Suddenly, California. Claiming to be part of the FBI detail checking up on security before the president’s arrival, three men arrive at the home of the Benson family: Ellen, an over-protective war widow, her young son “Pidge”, and her father-in-law, “Pop” Benson. The house is on top of a hill overlooking the station, making it a perfect perch from which to shoot the president. However, it soon becomes clear that the men are not Government agents but assassins, led by the ruthless John Baron, who take over the house and hold the family hostage.