A tale of tragedy, confusion and murder as the lives of a man grieving the death of his daughter, two would-be thieves, and a madman and his servant intertwine with each other when a cosmic phenomenon causes one day to become longer than the rest.

This third film in the series follows a group of marine biologists attempting to capture a young great white shark that has wandered into Florida's Sea World Park. However, later it is discovered that the shark's 35-foot mother is also a guest at Sea World. What follows is the shark wreaking havoc on the visitors in the park.