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.

Potters Bluff, Rhode Island. may seem to be a sleepy little town. At least for the casual visitor and the local sheriff, Daniel Gillis. However, all of a sudden, there are a lot of strange murders where strangers or people passing through are killed by mobs of townspeople. Only Sheriff Gillis has no clue to what’s going on. Fortunately, the town has an excellent undertaker, William G. Dobbs, who is happy to take care of this sudden death-wave which is good for his business. Gillis soon discovers clues that lead to many of the local inhabitants involved in the killings, including his own wife Janet.