Scientist Cordell McQueen is killed in South Africa in an attack by a shark, the very thing he's gone there to investigate. A cryptic message left on his colleague Casper Van Dien's answering machine sends Van Dien and McQueen's sister Jenny McShane are off to South Africa to investigate.
What they find when they reach the coastal village where the attack occurred is a town ready to die. The resort that Ernie Hudson operates has no tourists and the fisherman don't go out at all because they're afraid of the water. Over the past few years there's been an unaccounted for spike in the number of shark attacks. The only thing operating is a scientific research institute where another colleague Bentley C. Mitchum is conducting research into a cancer cure.
Of course all this ties together with Mitchum conducting some really ghoulish experiments and Hudson playing everyone for suckers. Mitchum maybe thinking of a Nobel Prize for Medicine, but Hudson's got a far more practical motive for his actions.
Shark Attack is your average action adventure film with the cast all fitting nicely into their roles. One thing I would have done was cut Mitchum's death scene, just have him die with no last words. That particular piece of dialog was truly atrocious. Someone should have sicced one of those spiked up sharks on the writers.