The In Crowd

After being released from the mental institution, Adrien Williams is leveraged by her former doctor Henry Thompson who arranges a job at a glamorous East Coast country club. Henry pushes to get her back on her feet, believing a stable routine will help her. Adrien steps into a world of wealth, status, and scrutiny as she meets the club's social circle.

Brittany Foster befriends Adrien and takes her under her wing, inviting her into a clique of wealthy teenagers. At first Adrien enjoys the closeness and protection of this new circle, feeling accepted after so long on the outside. Brittany’s charm masks a competitive undercurrent that soon unsettles Adrien.

As Adrien grows closer to Brittany’s friends, the group comments on how much Adrien looks like Brittany’s older sister Sandra who moved away. The resemblance fuels gossip and makes Adrien a magnet for attention from Matt Curtis and others. Brittany starts watching Adrien more closely, sizing up the perceived threat.

Matt Curtis shows romantic interest in Adrien, catching Brittany off guard and making her manipulation of the group feel more urgent. Adrien begins to sense hidden motives and starts to question Brittany’s true nature. The social circle tightens as Brittany schemes to protect her own position.

Brittany steals Adrien’s confidential file from Henry’s office, hoping to uncover Adrien’s past and perhaps use it to cement her control over the group. The file exposes Adrien’s history as a patient, revealing the vulnerability Brittany can exploit. The move marks Brittany’s turn toward more dangerous manipulation.

Brittany overhears Kelly explaining to Adrien the situation of her missing sister, which enrages her and deepens her sense of betrayal. This discovery pushes Brittany toward dangerous, desperate acts to protect her status. The tension between them builds toward a breaking point.

To keep her secret under wraps, Brittany drowns Kelly. The murder is swift and brutal, but Brittany still manages to project innocence to others. The group remains oblivious to her crimes for now.

Following Kelly’s death, Brittany ruthlessly kills Henry Thompson and pins the murder on Adrien. The supervisor at the club readily believes Adrien is the killer, allowing the real culprit to escape suspicion. Adrien becomes the prime suspect in a crime she did not commit.

Adrien escapes the mental institution with the help of Bobby, one of Brittany’s friends. The escape triggers a fresh chance to clear her name and confront Brittany. She heads back toward the country club, determined to uncover the truth.

Adrien returns to the country club during the end-of-summer party, hoping to reveal Brittany’s crimes. She uses information from Kelly’s explanation to piece together that Brittany killed Sandra and faked her sister’s disappearance. The reveal builds dramatic tension as guests unknowingly rally around Brittany.

Arriving dressed as Sandra, Adrien confronts the tense crowd, forcing Brittany to realize her cover might fail. Brittany flees to the woods to confront the evidence of Sandra’s fate.

In the woods, Brittany digs up Sandra’s corpse, hoping to prove that Sandra is truly dead and disprove Adrien’s claim. The discovery shocks the attendees and shifts the balance of power in the circle.

Adrien confronts Brittany in front of the gathered crowd. Brittany attacks Adrien, and in a tense moment she confesses why she killed her sister, exposing the warped motive behind her actions. The onlookers recognize Brittany’s madness and the crowd’s reaction seals her downfall.

Adrien leaves the country club and moves on with her life, while Brittany ends up back in a mental institution. In the final scene, Brittany uses her charm on a male orderly, leaving the audience to believe she might escape again.