The story unfolds with two aspiring filmmakers, Matt and Owen, who embark on a daring project that revolves around a gang of bullies and the desperate retaliatory actions of two students pushed to their limits. Their film, The Dirties, serves as a heartfelt tribute to a range of influential classics such as Being John Malkovich, Irréversible, Pulp Fiction, and The Usual Suspects. At the heart of Matt's drive lies his own painful history with bullying, revealing the stark and often overlooked truths faced by countless students.
As the duo dives deeper into their creative journey, they engage with peers and faculty to shed light on the often complicated quest for assistance in bullying situations. Unfortunately, their investigations reveal a disheartening reality: authority figures frequently trivialize the intricate nature of the bullying experience. The editing room buzzes with activity as they stitch together their film, gradually uncovering a tangled web of relationships and unrequited crushes, including the poignant acknowledgment of Owen's long-held feelings for Chrissy.
Throughout the filmmaking process, they capture additional scenes, with Matt orchestrating an awkward moment for Owen in his quest to impress Chrissy. The atmosphere thickens as they present the rough cut to their teacher, Mr. Muldoon. Yet, what began as a creative endeavor morphs into something darker, unveiling unsettling elements: graphic violence and harsh expletives that illustrate the characters' brutal realities, ultimately leading to the unsettling depictions of violence against students and teachers.
Mr. Muldoon demands significant revisions, but the hurt and embarrassment bubble to the surface as Matt witnesses the mocking reactions of his classmates. Ultimately, the edited film is shown during class; despite Owen's stoic demeanor, laughter ensues as his peers ridicule their work. A harrowing incident—a rock thrown at Owen during their walk home—serves as a stark reminder of the painful realities faced by students who find themselves in the line of fire.
As Matt begins to conceptualize a sequel, The Dirties II, he channels his emotions into his music, hoping to capture Chrissy's affection. However, the pressures of ongoing bullying and social isolation weigh heavily on both of them. In a troubling twist, Matt stumbles upon blueprints for his school project at the library, raising suspicions about how he accessed sensitive information without proper clearances.
The narrative escalates with Owen experiencing a brutal physical assault during lunch, poignantly underscoring the inescapable cycle of bullying. Under the obscuring cloak of night, the boys huddle around a flickering bonfire, their minds consumed by the torments they have endured. Matt meticulously measures lockers and takes photos, provoking Owen's suspicion. When Matt confides in Chrissy about their plans, it is clear he is playing a deeper game that remains hidden from Owen.
Matt's obsession with the Columbine High School tragedy and his insatiable urge to read Catcher in the Rye hint at more than just a passing interest; it showcases a descent into dark desires. His basement, which once felt like a refuge, transforms into a sort of shrine filled with chilling diagrams and photographs hinting at ominous intentions. Owen's growing concern prompts him to confront Matt about his increasingly erratic demeanor.
As tensions bubble beneath the surface, Matt's self-identification as a psychopath becomes a grim refrain, illustrating his deteriorating grip on reality. What once united the friends is now giving way to distrust, their bond unraveling at the seams. During a heated argument, Matt's insecurities about Chrissy come to light; he believes her interest in Owen stems solely from Matt's manipulative influence. Yet, Owen counters that John’s jealousy is rooted in his own crippling solitude.
After their confrontation, Matt finds himself adrift, reflecting alongside his mother, who urges caution by illustrating how insanity lies in failing to differentiate between fantasy and reality. Alone once more, Matt returns to where he and Owen shared a bonfire, igniting his notebooks in a symbolic act of self-destruction. The silence is shattered by distant gunfire, while Owen's frantic calls echo unanswered.
As night envelops the school, Matt emerges armed with a duffel bag filled with firearms, fixated on an alarming goal. He prowls the familiar halls, seeking out Josh and Jackman, documenting the ensuing chaos with his camera. The climax approaches as he confronts Owen, whose fear is palpable as he realizes the depths to which their friendship has plummeted—transformed into something foreboding. In a dimly lit classroom, Matt coldly inquires, “What are you doing?” a question heavy with a once-familiar intimacy. This moment teeters on the brink of a catastrophic shift in their fractured relationship.
