Three boys burst into Uncle Jerry's diner with a newspaper reporting the first fatal shark attack on a New Jersey swimmer.

Old whaling captain Wilson contradicts Uncle Jerry, insisting that certain sharks will attack and kill humans.

Captain Wilson tells the boys how he survived alone at sea after a shipwreck, coming face to face with a deadly shark.

The boys stage a fake shark attack at the creek using a tile from the factory, leaving Chet terrified and humiliated.

Uncle Jerry explains that the boys' prank is a sign they like Chet and tells him he should prank them back.

Dr. Jay and Mr. Colton arrive at the diner with news of a second fatal shark attack, killing a man named Charles Bruder.

Chet's Creek Devil prank at the creek backfires when the boys respond with fury instead of laughter and storm off.

Chet breaks down crying and tells Uncle Jerry he does not belong in Elm Hills and wants to run away to California.

While swimming alone at the creek, Chet is rammed underwater by the shark, which scratches open his chest and draws blood.

Chet rushes to the hardware store to warn townspeople about the shark in the creek, but the crowd laughs and dismisses him.

Chet tells Captain Wilson he saw a shark in the creek, and Wilson believes him instantly and springs into action.

Chet spots a gray shark fin cutting through the water directly toward Sid, who stands frozen with fear.

The shark bites Chet's leg; his three friends grab his arms and pull hard against the shark to tear him free.

A newspaper reports that Lester Stillwell, eleven, is killed by the shark, and a young man who tried to save him also dies.

Sid, Dewey, and Monty travel two hours to visit Chet in the hospital and are relieved to find him alive.

Chet Roscow is a ten-year-old boy living with his Uncle Jerry in Elm Hills, New Jersey, when news of a fatal shark attack reaches their small town diner. Captain Wilson, a local whaling veteran, confirms that sharks can be deadly, but most residents dismiss him as unreliable. When Chet's new friends prank him by staging a fake shark attack, he retaliates with his own prank, which badly backfires and deepens the rift between them. Chet later encounters the real shark alone in the creek, sustaining a chest wound, and rushes to alert the town—only to be dismissed by everyone except Captain Wilson. After Captain Wilson mobilizes to help, Chet dives into the water to save his friend Sid as the shark attacks, and the boys work together to pull Chet free from the shark's jaws. Chet recovers in the hospital as his friends make the long journey to visit him, and together they forge a bond born of survival.

The headline events of the 1916 shark attacks and Chet's survival.

Chet recalls arriving in Elm Hills to find Uncle Jerry waiting on the train platform to wrap him in a long, warm hug.

Chet wonders if he will ever truly belong anywhere, fearing he will end up like Captain Wilson—a tiny speck alone at sea.

An intense heat wave descends on Elm Hills, making the summer almost unbearable for everyone in town.

Sid tells Chet that the boys are always looking for him at the creek and invites him to join them swimming after work.

Chet storms away from the creek after the prank, convinced the boys invited him to the water only to mock him.

Dr. Jay tells the group about the Creek Devil, a monster said to live in Matawan Creek and take a child once every decade.

Dr. Jay reveals that Uncle Jerry was terrified of the Creek Devil as a boy, making Uncle Jerry blush in front of Chet.

Chet arrives at the creek early and stages a scene with fake blood, a boot, and his work cap to set his prank.

Uncle Jerry shocks Chet by revealing that he begged Chet's mother for years to let Chet come live with him in Elm Hills.

Uncle Jerry tells Chet how he once fled Elm Hills after a career-ending baseball injury but eventually returned, learning running away solved nothing.

Chet arrives at the empty creek and begins scrubbing away the ketchup stains left over from his failed Creek Devil prank.

Mr. Colton tells Chet that the extreme heat must be muddling his mind rather than take his shark warning seriously.

Chet learns that the shark tore away much of his calf muscle and that he came dangerously close to losing the entire leg.

The boys tell Chet that searchers found and cut open a shark, discovering human bones inside its stomach.

Uncle Jerry tells Chet he plans to ask Chet's father to move to Elm Hills and help run the diner together.

When Chet first arrived in Elm Hills, Uncle Jerry's warm welcome on the train platform offered him a sense of home he had never known, though Chet still feared he might never truly belong. As a heat wave grips the town, Chet grows closer to Sid, Dewey, and Monty, learning the rhythms of creek-side friendship. After the boys' prank humiliates him, Chet struggles to trust anyone, but the arrival of a new shark attack report and the legend of the Creek Devil plant the seeds of his retaliation plan. When that plan goes wrong, Uncle Jerry shares his own vulnerable history—revealing that he begged for Chet to live with him—and urges Chet to stop running away. When Chet returns to the creek to make amends and encounters the real shark, no one in town takes his warning seriously, deepening his isolation at a critical moment. His recovery in the hospital brings its own revelations, including the true extent of his injuries and Uncle Jerry's plan to keep the whole family together in Elm Hills.

The friendships, fears, and smaller moments that shape Chet's summer.

Swimming alone in Matawan Creek, Chet notices a gray fin slicing silently through the water and realizes something is watching him.

Uncle Jerry tells Chet and the boys that a shark attacking a human is impossible, comparing the danger to a cherry pie.

Uncle Jerry dismisses Captain Wilson's shark story, pointing out that Wilson cannot even remember his own wife has been dead for years.

Chet admits to Sid, Dewey, and Monty for the first time that he actually hates moving around so much of his life.

Chet receives a letter from his mother in California promising a room is waiting for him whenever he is ready to join his parents.

After the creek prank, Chet ignores the boys when they visit the diner the next morning and hides in the back to avoid them.

After hearing the Creek Devil legend, Chet devises a plan to dress as the monster and use it to prank his three friends.

Uncle Jerry admits to Chet that he was lonely during all the years Chet was traveling with his parents across the country.

As Chet scrambles out of the creek, two black killer eyes emerge from the water beneath him, confirming the shark is real.

Captain Wilson explains to Chet that strong tidal conditions can sweep a shark from the open Atlantic Ocean into Matawan Creek.

As Chet shouts warnings at the creek, the boys mock him by pretending to climb out of the water and jumping back in.

A gunshot rings out and Captain Wilson's boat motor rumbles close as Chet collapses on the dock with blood pouring from his leg.

Newspapers call Chet the miracle kid, but lying alone in his hospital bed, he has never felt more isolated in his life.

The boys apologize to Chet for their past pranks, and Sid announces that the four of them are calling a permanent truce.

Chet falls asleep dreaming of being an old man in a diner, telling young boys the story of how his friends refused to let him go.

The story opens with a flash-forward of Chet alone in the water watching a gray fin slice toward him, a scene that frames everything that follows. At the diner, widespread disbelief is established immediately when Uncle Jerry dismisses both the newspaper reports and Captain Wilson's firsthand account as impossible. As Chet carefully admits to his new friends that he hates moving around so much, a small but crucial vulnerability opens the door to genuine connection. Misunderstandings pile up through pranks and mistrust, but Uncle Jerry's confession about his own loneliness gives Chet a new framework for what belonging really means. The moment Chet sees the shark's killer eyes in the creek marks the story's pivotal shift from rumor and fear to deadly reality, and Captain Wilson's quiet explanation of how the shark entered the creek gives Chet the knowledge and courage to act. In the aftermath of the attack and recovery, the boys' sincere apology and Chet's dream of one day telling his own story as an old man mark his full transformation from a lonely, transient child to someone who knows with certainty he is not alone.