Mirage (1965 film)

Mirage is a 1965 thriller directed by Edward Dmytryk from a screenplay by Peter Stone, based on the novel Fallen Angel, written by Howard Fast under the pseudonym Walter Ericson the novel is not credited by title onscreen. The film stars Gregory Peck, Diane Baker, Walter Matthau, and Kevin McCarthy, and was released by Universal Pictures.

On the street is the body of peace activist Charles Calvin Walter Abel, who apparently jumped from his office. Soon Stillwell returns to the stairwell, but there is no subbasement. A man in the basement, Willard George Kennedy, tells him to leave.At Stillwells apartment building, a stranger, Lester Jack Weston, pulls a gun on him. He tells Stillwell to go to Barbados and meet the Major, and to take his briefcase. Stillwell manages to knock out the gunman and drags his body out of the apartment. ........

Source: Wikipedia