After leading a jury to wrongly sentence a man, Abigail enters her new teaching job at the law school with a newfound commitment to ethics. When she takes over her new class, it includes Vincent, an intensely ambitious student who will do anything for an A. When Abigail fails him for academic dishonesty, Vincent threatens that he will stop at nothing to get what he wants. As Vincent's devious plot begins to unravel, she must take her life into her own hands, or Vincent will take it himself.

After the events at Lake Victoria, the prehistoric school of blood-thirsty piranhas make their way into swimming pools, plumbing, and a newly opened water park.