Gabriella finds an unfinished symphony that was written by her late uncle Octave Barron who found inspiration through murder. Thrilled by it's possibilities she hires Marius (Ben Cross) to complete the symphony. As he begins work on the piece he finds himself stuck in a bizarre murdering cycle handed down from the original composer.
When a well-known environmental researcher is murdered in the Amazon jungle, an arrogant photojournalist joins forces with a beautiful young activist to find out who is responsible. Along they way, they fall in love as they discover the men responsible for the killing would be more than willing to murder again if it will keep them quiet.
Walter Paisley, a busboy at a cappuccino bar called the Jabberjaw, is praised as a genius after he kills his landlady's cat and covers it in plaster. Pressured to produce more work, he goes after bigger subjects.
Doctor Baines has been conducting genetic experiments on piranhas and has made them virtually unstoppable. Unfortunately, his assistants, Maggie and Paul, accidentally release the hybrids into the Lost River Lake threatening to destroy everyone in their path. Can they prevent the flesh-eating piranhas from escaping into the ocean and spawning?