The Window (1949)

Director: Ted Tetzlaff
Cast: Anthony Ross, Arthur Kennedy, Barbara Hale, Bobby Driscoll, James Nolan, Paul Stewart, Richard Benedict, Ruth Roman

Synopsis:

An imaginative boy who frequently makes things up witnesses a murder, but can’t get his parents or the police to believe him. The only people taking him seriously are the killers – who live upstairs, know that he saw what they did, and are out to permanently silence him.