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The story returns to the Brody family in Amity Island. Martin Brody had died of a heart attack, although his widow, Ellen Brody (Lorraine Gary), claims that "it was the fear [of the shark] that killed him." She discusses with her youngest son Sean (Mitchell Anderson), and his fiance Tiffany (Mary Smith), arrangements for the Christmas season. Now working as a police deputy in Amity, Sean is dispatched to clear a log from a buoy. As he does so, he is attacked by a shark. He is killed as his screams are drowned out by the carol singers on the island.
Ellen is convinced that the shark had deliberately targeted Sean due to some evil curse, and visits her eldest son, Michael (Lance Guest), in the Bahamas. Michael now works as a marine biologist. Fearing he will be attacked next by the shark, Ellen hopes to convince him to take up a new job on dry land. She meets Hoagie (Michael Caine), and they begin dating. Michael's wife Carla (Karen Young) is an artist and one day during her art exhibit, Ellen's granddaughter Thea (Judith Barsi) asks if she can go out on a banana boat with her friend Margaret and her mother (Diane Hetfield). The shark attacks the boat with Thea on it. The shark ends up devouring Margaret's mother in the process with blood flying everywhere, leaving Thea unharmed, but in a state of shock. Ellen becomes convinced that the shark has tracked her family to the Bahamas. She takes a boat out to sea on her own, intent on confronting and killing the shark to break the curse, or sacrificing herself hoping the shark will leave her family alone.
The shark leaps out of the water to attack Jake (Mario Van Peebles)
Hoagie flies Michael and his friend Jake (Mario Van Peebles) out to sea so that they can find Ellen quickly. Hoagie lands the plane on the sea, but the shark sinks it. Looking out for the shark while using a device that emits electromagnetic impulses to drive the shark mad, Jake moves to the end of the prow. The shark unexpectedly leaps from the surface of the water to grab Jake, biting into him and dragging him beneath the surface in a gory fashion. The device causes the shark to repeatedly leap out of the water and Ellen steers the boat directly for the shark, impaling it on the broken bowsprit, which somehow causes it to explode. After killing the shark, they find Jake mauled but alive. Near the end of the film, Ellen is relieved that the curse of the shark is no longer on her family. The film ends as Hoagie flies Ellen back to Amity Island.