Susan Stevenson (Ursula Andress) and her brother Arthur (Antonio Marsina) get off a plane somewhere in South America, allegedly in search of her husband. They team up with, Dr. Edward Foster (Stacy Keach). The three head into the jungle, get in more than a few fights amongst themselves, and view lots of gratuitous animal cruelty, notable an iguana getting eviscerated.

A deeply disturbed photographer and Vietnam veteran, named Kirk Smith, terrorizes Los Angeles by going around strangling lingerie-clad young women in their homes while taunting Lindsay Gale, a young psychologist, by calling her on a radio call-in show to describe his sexual hang-ups and misogynistic ways, while a local police detective, Lt. McCable, is always two steps behind in trying to catch the psycho.