In a Caribbean coastal town, diving instructor Anne Kimbrough is suspicious of a series of mysterious deaths and disappearances around the resort. Initially dismissed by local authorities, including her estranged husband, Police Chief Steve Kimbrough, Anne soon discovers that genetically engineered piranhas are behind the attacks. These deadly fish are not only more aggressive but also have developed the terrifying ability to fly. Anne teams up with her new love interest, Tyler Sherman, a scuba diver with a hidden agenda, to expose the truth and stop the piranhas before the town's annual fish fry festival becomes a bloodbath.

As tensions rise and the body count increases, Anne and Tyler race against time to warn the townspeople and find a way to eradicate the killer fish. Complicating matters, government agents and a corporate cover-up reveal a sinister plot behind the piranha's creation. Using their diving skills and wits, Anne and Tyler face harrowing underwater confrontations and daring aerial battles. With danger lurking in the water and air, they must overcome their fears and work together to save the community from an unimaginable aquatic menace.