Another killer great white shark menaces Police Chief Martin Brody's town. Police Chief Martin Brody suspects that another great white shark is to blame for the deaths of two divers and a killer whale, just like in the first installation of this series. As he did previously, Mayor Vaugn contradicts Brody, hoping to avoid panic on their beaches. Brody's suspicions deepen when he finds the human remains of an earlier shark-related incident floating in the water. Still unable to prove the connection, Brody forbids his teenage son from swimming or sailing.
A paranoid Brody watches the water around the beach vigilantly and fires his gun at an approaching shadow he fears to be the killer shark. He is embarrassed and discredited when the approaching shape turns out to be just a school of fish. However, a photograph taken by one of the divers killed earlier is recovered. It is a blurry photo of a shark. Even with this evidence, the Mayor and his coworkers don't want to take action. Instead Brody is fired.
Later, Brody's son Mike goes sailing against his father's wishes. He takes his younger brother with him to keep him from tattling on him. As they sail, they come across a team of divers who will soon encounter the shark. The diving group leader, Tom, is a friend of Mike's family. When he sees the shark, he rushes to the surface but suffers internal injury from surfacing too quickly. When Brody sees Tom being taken the hospital later, he suspects that Tom encountered the shark, thinking that a diver as experienced as Tom would have no other reason to surface so quickly.
Brody realizes that his sons must be at sea, so he goes out after them, fearing for their lives. He finds an injured girl stranded in her broken boat whose boyfriend was killed by the shark. Brody continues after his sons. Mike is meanwhile running into trouble when the shark bumps two of the sailboats together. Mike is knocked unconscious in the collision and his friends take him to land for treatment. Many of the teenagers remain tangled in their damaged sailboats. A helicopter is sent to save the teenagers, but the shark attacks the craft and eats one of the girls.
Brody meets up with his son on land and Mike tells him everything. Brody goes out after the remaining teenagers who are drifting out to sea. The shark attacks Brody's boat and he is thrown from the vessel. The teenagers manage to reach shore safely while Brody hastily hatches a plan to electrocute the shark by tricking it into biting one of his boat's electrical cables. The plan works and the shark dies, sinking to the ocean floor. Brody joins the teenagers and awaits rescue.
Best part of story, including ending:
It's all very predictable, but it's enjoyable if you don't think too hard about it.
Best scene in story:
I like watching the shark get electrocuted and die.
Opinion about the main character:
It was frustrating to know that Brody was right about the shark attacks but have all the other characters deny him. He seemed powerless.