This stylish Brian DePalma thriller plays off the theme of the unsuspecting witness who discovers a crime and is thereby put in grave danger, but with a novel twist. Jack is a sound-man who works on "Grade-B" horror movies. Late one evening, he is "sampling" sounds for use on his movies, when he hears something unexpected through his sound equipment and records it. Curiosity gets the better of him when the media become involved, and he begins to unravel the pieces of a nefarious conspiracy. As he struggles to survive against his shadowy enemies and expose the truth, he doesn't know who he can trust.

During the editing process, two reels of footage from the Liberty Parade sequence were stolen and were never to be seen again. This meant that the scenes had to be reshot at a cost of $750,000. Cinematographer Vilmos Zsigmond was no longer available, so he was replaced by László Kovács.

Sally:
Ya know, the only trouble I ever got into was when I was TOO careful!

Crew or equipment visible: Film crew visible during overhead shot after Jack crashes through police barricade.