Barry drives under the influence and hits young Daniel Gregg on his bicycle at night, killing him.

The four teens vote to keep the accident secret; Julie dissents but is outvoted, and a pact is formed.

Julie ends her relationship with Ray after he votes to keep the accident secret rather than go to the police.

Julie receives an anonymous note in her mail with a stark message: someone knows what she did last summer.

Barry dismisses the threatening note as a harmless prank when Julie and Helen show it to him.

A car follows Barry through the dark after he leaves Helen's apartment, matching every turn he makes.

Ray receives a yellowed, heavily handled newspaper clipping about Daniel Gregg's hit-and-run death in the mail.

Barry answers a mysterious phone call and walks alone to the college athletic field on Memorial Day evening.

A gunshot concealed by fireworks noise strikes Barry on the athletic field, nearly paralyzing him.

Collie drives Helen to the hospital after Barry's shooting and questions her about whether Barry has any enemies.

Julie and Ray visit the Gregg family home and meet Megan, Daniel's sister, who explains her mother is now in a psychiatric hospital.

Barry lies to Ray, claiming he was shot during a robbery rather than in connection to the accident.

Collie corners Helen in her apartment and reveals he is Daniel's half-brother seeking revenge for the hit-and-run.

Helen smashes her bathroom window with a perfume bottle and jumps from the second-story window to escape Collie.

Ray knocks out the attacker with a flashlight outside Julie's home, saving her from being strangled.

Four teens accidentally kill a young boy named Daniel in a hit-and-run accident and swear a pact of secrecy to protect Barry, who was driving drunk. Almost a year later, Julie receives an anonymous note revealing that someone knows exactly what happened last summer. The mysterious figure escalates the threat, luring Barry to an athletic field where a gunshot nearly paralyzes him. While Barry lies to protect himself, Julie and Ray investigate and visit Daniel's grieving family to search for answers. The antagonist is eventually revealed to be Daniel's half-brother, who attacks Helen in her apartment before trying to strangle Julie at her home. Ray saves Julie at the last moment, and the teens are finally forced to face the consequences of the secret they have kept.

The core hit-and-run tragedy and its violent consequences.

Helen wins a Channel Five beauty contest and earns a job as a television presenter, allowing her to afford her own apartment.

Julie anonymously sends yellow roses to Daniel Gregg's funeral, driven by guilt she cannot express openly.

The antagonist traces the teenagers back to Julie by asking a flower shop about the red-haired girl who sent yellow roses.

Ray returns to his hometown after spending a year working odd jobs on California fishing boats.

Bud arrives at Julie's door for a date while Ray is still visiting, and the two men briefly meet.

Helen allows a charming new neighbor named Collie to join her at the apartment complex pool.

Helen returns to her apartment door to find a magazine cutout of a boy on a bicycle taped there.

Barry's mother refuses to let Helen visit Barry in the hospital and publicly blames her for his shooting.

Julie and Ray urge Helen to break the secrecy pact and go to the police, but Helen refuses to betray Barry.

Helen recalls that her sister Elsa predicted on the night of the accident that Barry would eventually leave her.

Ray slips past hospital staff into Barry's room and discovers Barry cannot feel his legs.

Mrs. James senses a powerful premonition that something terrible will happen and pleads with Julie to cancel her date.

Collie insults Helen at the pool by calling her self-centered, then announces he has a date with someone else.

Bud tells Julie he is Daniel's brother and reveals that the yellow roses she sent to the funeral led him to her.

Police arrive after Helen's escaped warning, and Ray begins telling the full truth about the accident to the authorities.

In the aftermath of the accident, Helen parlays her looks into a television career while Julie channels guilt into her academics and eventually receives an acceptance to Smith College. Julie's anonymous gift of yellow roses at Daniel's funeral unknowingly gives the antagonist the clue he needs to track each teenager down. When a charming neighbor named Collie enters Helen's world and a serious veteran named Bud begins dating Julie, neither girl suspects these are the same man with a dangerous motive. Barry's lies and his mother's interference block Helen from the hospital and leave all four friends dangerously uninformed about the real threat. As the antagonist closes in, Mrs. James's premonition moves her to beg Julie to cancel her date on the critical night. The teens' secrets finally unravel when Helen's desperate escape alerts the police and Ray begins confessing the full truth about the accident.

The guilt-driven choices and hidden connections that draw the teens into danger.

Barry pressures Ray to end his 911 call before giving the operator their names or location.

Ray votes with Barry to hide the accident, siding with his best friend against his own conscience and against Julie.

Barry swears all four teens to secrecy as police sirens approach the accident scene on the road.

Ray recognizes that the threatening envelope is genuine and concludes that someone truly knows about what happened last summer.

Collie visits Helen at her apartment after shooting Barry, posing as a concerned neighbor while secretly monitoring his plan's aftermath.

Ray notices men's clothing on the Gregg clothesline and fresh yellow paint on the house trim, suspecting someone else is living there.

Julie nearly breaks the secrecy pact at home but stops herself from telling her mother the truth about the accident.

Julie becomes convinced that Helen's jealous sister Elsa is behind the threatening messages and the shooting.

Bud bets Ray that Julie will not go to Smith College in September, which Ray wrongly interprets as a marriage plan.

Ray calls Helen with Barry's false robbery story, which she accepts, keeping her from connecting the shooting to the accident.

Barry regains feeling in his foot in the hospital and calls Ray to confess the truth about the threatening phone call.

Helen realizes Barry lied about the phone call before the shooting, understanding he put all his friends' lives at risk for himself.

Collie tells Helen he lured Barry to the field with a false promise of photographic evidence of the accident, then shot him.

Bud insists Julie walk him to his car when she tries to cancel the date, isolating her from her mother.

Ray connects yellow paint on Bud's hands to the Gregg house trim, realizing Bud is Daniel's half-brother and rushes to Julie.

The night of the accident, Barry forces Ray to abandon a 911 call and then pressures the group into a secrecy pact against Julie's wishes, with Ray betraying his conscience to side with his best friend. When Ray returns to town, he immediately recognizes the threatening messages as genuine danger while the others remain in denial, and he and Julie quietly search for the source of the threat. The antagonist maneuvers behind the scenes, posing as a helpful friend after shooting Barry and feeding false stories that keep the teens from seeing the true picture. Critical clues — yellow paint, men's clothing, and a suspicious bet — go unconnected until it is almost too late. Barry's physical recovery leads him to confess the truth to Ray, and Collie's confrontation with Helen finally exposes the full revenge plot. Ray pieces together the final evidence at the last possible moment and acts to save Julie from the antagonist's fatal attack.