Not a lot happens in Suddenly but all that changes when the President is due to leave his train there. Federal agents swarm over the place including one team which goes to a house overlooking the railway station owned by former agent Pop Benson (James Gleason) and his daughter Ellen (Nancy Gates).
However, the team led by Baron (Frank Sinatra) are not federal agents after all but assassins who want to use the house to commit their crime!
This is a great film, tense and gripping as the ruthless and brutal Baron will stop at nothing to commit their mission, being willing to hurt or even kill anyone, men, women and children!