A scuba diving instructor, her biochemist boyfriend, and her police chief ex-husband try to link a series of bizarre deaths to a mutant strain of piranha fish whose lair is a sunken freighter ship off a Caribbean island resort.

While everyone knows you can't fight City Hall, there are those who, for whatever reason, can't resist the challenge. Three slightly disturbed psychiatric patients decide to take on the government. What ensues includes car chases, a ferry boat hijacking, strip-teases and lots of fun!