Story for part four picks up after the Roy Scheider character of Jaws and Jaws 2 has died of a heart attack. Lorraine Gary nicely reprises her role as the now-widowed Ellen Brody, living a peaceful life in the New England resort town of Amity. One of her sons, a deputy sheriff, is killed by a shark while out in the channel on a routine complaint.
Ellen heads down to the Bahamas to be with her other son, marine biologist Michael (Lance Guest), and his family (Karen Young makes the most out of the small role of Michael’s wife), and tries to convince him to quit his job because she’s sure ‘it’ is out to get the family.
Michael Caine is Ellen’s delightfully irresponsible suitor, but doesn’t get enough screen time to really develop the character. After the shark practically walks up the beach to get a bite out of the third generation Brody (Judith Barsi), Ellen goes after ‘it’ by herself.
Pacing leaves a lot to be desired and the moment-of-attack sequences, full of jagged cuts and a great deal of noise, more closely resemble the view from inside a washing machine.