Your Fault

On Noah Moran/Leister’s 18th birthday, her boyfriend and recent stepbrother by marriage Nick Leister (whose parents disapprove), is away doing a law internship in San Francisco. Melancholy, as her abusive father Jonás' died a year ago, her closest friend Jenna reminds her of their graduation party. Meanwhile, Nick surprisingly shows up.

Noah is enrolled at the local college, so Nick rents a nearby flat to keep their relationship strong. She assumes it is for them both, so his commitment-phobia kicks in. Nick's reaction causes Noah to storm out.

Out later, Noah fills Jenna in, so her friend mentions Nick's mother-induced abandonment. Simultaneously, Nick and Lion talk about their relationship problems and Lion's feelings of inadequacy. Noah suggests they eat more cheaply.

Rafaella shows Noah her shared college flat. There, Noah meets Briar, who took two years off after high school. At his father William's law firm, Nick meets fellow intern and recent Harvard graduate Sophia.

Rafaella shows Noah a photo they intercepted, reminding her to be careful due to the rumors of her being a gold digger. Noah insists Nick loves her, but she is unconvinced. Uncomfortable, Noah leaves for her apartment. Briar is throwing a house party, but quickly ends it. The next door neighbor Michael pops in to introduce himself.

Initially, Nick works to prove he is no longer into fighting, racing, and girls. However, working alongside the attractive Sofía, he becomes distracted. Rafaela and William had actually hired her to potentially break up Nick and Noah.

Anabel, Nick and Maggie's mother who abandoned him 10 years ago, constantly calls him. She corners him upon collecting Maggie, but he leaves without a word. Nick and Noah spend the afternoon together then, dropping her off at her apartment, he discovers Briar is her roommate, but hides they know each other.

Lion inadvertently thrusts Nick back into his past life. As his garage faces financial ruin, he agrees to deliver an unknown substance, which Nick verifies is cocaine. Lion enters the pool hall alone, but Nick, then Noah follow close behind. They manage to get out, but get arrested.

When Noah stops home for her things, she comes across a dinner party with Nick, their parents, Sofía and her parents, William's longtime friends. They insinuate that one day Nick and Sofía might become a couple.

Anabel manipulates Noah into letting her into the Leisters'. There, the older woman distracts her with photos of the extramarital affair between Rafaella and William. Anabel then steals William's toothbrush.

Nick and Sofía are sent to fight a case in London. He meets with his grandfather Andrew, who reveals he took care of the psychologically delicate Briar. The intern lawyers win their case. During the trip, Nick repeatedly checks that Noah stays in his apartment, which Briar gets wind of.

Briar coaxes Noah back into their apartment, where they party with Michael until she feigns sleepiness. He then almost seduces her, but she rejects him. Just as Noah is letting Michael out, Nick appears. His jealousy angers her, so she suggests they end it. Then Nick gives her a two-week ultimatum-- decide about them by the Gala or he moves to London.

Meanwhile, Lion proposes they participate in a rally for 15,000 on Gala night, believing Jenna and Noah will be distracted. However, the two show up to compete. Unbeknownst to everyone, Briar calls the cops, so the road blocks are lifted. After a harrowing race, Noah and Nick together defeat the recently-released-from-prison Ronnie, so Lion can win.

At the Gala, just as Lion says he is finished with racing and worrying about money, Jenna ends things. Briar, who came with Noah, lets Anabel in. She confronts William, revealing her daughter Maggie is his. Nick is angry Noah was involved, so kisses Sofía, then storms off with Lion.

Briar shows Noah photos which imply Nick is involved with Sofia, so she leaves dejected. Nick soon returns, where a vengeful Briar convinces him Noah has left to kill herself. Actually, she returns to their shared apartment, where Michael seduces her. Noah returns to his apartment, walking by Nick coldly. He drives off.

Noah visits Jonah's grave to say goodbye, finding Nick's promise to always protect her on the headstone.