John Travolta stars as Jack Terry, a sound effects engineer for cheapie horror exploitation flicks. When a producer deems the victim's screams and wind effects used in their slasher film as substandard, Jack determines to capture new recordings. While outdoors, his tape captures audio from a nearby car careening off of a bridge and into a river after its tire blows out. Jack jumps to action to save a drowning woman (Nancy Allen) from the vehicle, but the driver dies, later revealed to be the presidential frontrunner, Pennsylvania Governor George McRyan. While listening to the tape, Jack hears a gunshot just before the blowout, suggesting it was no accident. It's revealed that a photographer in the area (Dennis Franz) captured film of the incident, which Jack synchronizes with his audio, proving an assassin was the cause. The authorities and media want the proof, but an assassin (John Lithgow) seeks to silence Jack's obsessive quest for truth. Brian De Palma writes and directs this potent political thriller.