4.3.2.1

The four London friends—Joanne, Cassandra, Shannon, and Kerrys—meet at a diner and spot Dillon and Smoothy. In the rush to escape, Dillon drops a stolen diamond into Cassandra’s bag, binding the group to trouble. The girls part ways for the night, each carrying a fragment of danger that will pull them back together.

Shannon's family tensions flare as her mother leaves her father. Joanne invites Shannon to the 24-hour supermarket where she works, but the moment escalates when Dillon kisses Joanne, deepening Shannon's sense of betrayal. In a desperate act, Shannon grabs a Pringles tube and flees into the night.

After getting drunk at a bar, Shannon is assaulted by a gang and rescued by Kelly, who reveals she is hunting for 15 diamonds. One diamond is already in Cassandra’s bag, while the rest are concealed in the Pringles tube that fell from Shannon's possession during the assault. The encounter sets in motion the escalating diamond pursuit.

Shannon escapes and retrieves the Pringles tube, leaving a message for Joanne about the diamonds. Her pain deepens as she tracks down her mother and confronts the belief that she was never cared for, especially after revelations about a forced abortion in the family history. The weight of the diamonds intensifies her emotional burden.

Standing on the edge of a bridge, Shannon contemplates ending her life, overwhelmed by the diamonds and the weight of past family wounds. She hesitates, pulled back by fear and a glimmer of hope in what the others may do together.

Cassandra travels to New York City to meet a man she connected with online. She discovers he is a stalker who hacked her computer and captured intimate videos. After confronting the fake Brett, she defeats him and erases the incriminating footage, then retaliates by taking photos of his private parts as revenge.

Cassandra pressures her way into an audition with Jago Larofsky and earns a place at his prestigious piano school. She then heads back to London with a renewed sense of purpose, telling Joanne that she knows where Shannon is. The trip marks a shift in her resolve to help her friends.

Kerrys and her girlfriend Jas witness Manuel receive fresh instructions from Dillon and Smoothy. They break into Cassandra’s home and discover a panic room. Manuel locks them inside, then returns the package to Dillon and Smoothy while throwing a party.

Kerrys returns home, finds Shannon's mother's letter, and begins to mend fences with her father. She hatches a daring plan to locate Shannon by locking Manuel in the trunk of his car and driving off to find her, only to crash the car into Jo’s shop when Manuel tries to attack. The collision triggers chaos as the diamonds and loyalties collide.

Jo grows suspicious of her manager Tee, who has been moving the diamonds with Dillon and Smoothy and is now missing one. Tee betrays them by withholding funds, triggering a spree of violence in Jo's shop. Shannon arrives, Jo tries to get her to leave, and Dillon kisses Jo as Shannon remains unaware of the danger around her.

Shannon departs with the Pringles tube, unaware that it now contains fourteen diamonds hidden by Tee. The tension escalates as the group edges toward a confrontation that could resolve the diamonds’ fate.

Angelo intervenes to stop the bloodshed as Kerrys crashes Manuel’s car into Jo’s shop, forcing a chaotic scene. Jo helps Kerrys escape, while Kerrys leaves a note and a DVD implicating Tee to guide the others toward justice.

Tee is apprehended after Angelo restrains him and the police arrest him. Cassandra returns with the final diamond, and the four girls band together to locate Shannon and offer support as a united front. They hand the 15 diamonds to the police, and Kelly joins them on a flight to New York City to start anew.