Suddenly!

In advance of a presidential visit to the small town of Suddenly, California, a trio of FBI agents enters the Benson family's home to assess potential security risks. Once inside, leader John Baron (Frank Sinatra) reveals himself as a psychopathic assassin, and he kidnaps the family in order to use their house as his vantage point in his plot to kill the president. Sheriff Tod Shaw (Sterling Hayden) matches wits with the assassin and his gang in an attempt to save the day.

The film "Suddenly" (1954) entered the public domain in the United States because its copyright was not renewed in 1982. As a result, the film's copyright protection expired, and it became part of the public domain. This information has been verified through various reliable sources, including the United States Copyright Office.