A mute, illiterate Louisiana farmer's son with an extreme fondness for goats becomes a serial killer who goes after anyone who hurts goats, and wreaks havoc on an unsuspecting film crew shooting a film in the area. His method of killing is passing gas (farting) that is poisonous to his victims. The farts do not make any sound thus the name of the movie, Silent But Deadly. A subplot involves a small crew following a sheriff investigating the murders.