Samantha is a 16-year-old high school junior who hides her severe Obsessive Compulsive Disorder from her popular peers. She finds solace in competitive swimming, where the physical exertion quiets her mind, allowing her to embody a relaxed persona she calls "Summer Sam." At school, she conforms to the rigid expectations of her primary friend group, the Crazy Eights, terrified that they will discover her mental health struggles and ostracize her.

Caroline is an unconventional teenager who dresses in baggy jeans, hiking boots, and flannel shirts, sharply contrasting with the pristine style of the popular girls. She notices Samantha's distress and quickly earns her trust by listening objectively. She introduces Samantha to a secret poetry club called Poet's Corner, offering her a creative outlet away from the pressures of mainstream high school.

AJ is a guitar-playing student with sandy-colored hair and an unofficial leadership role in the secret poetry club. He harbors a lingering resentment toward Samantha and her friends due to a painful history of childhood bullying. He expresses his emotions through songwriting and plays a central role in maintaining the poetry club's safe environment.

Sue is Samantha's psychiatrist, a tiny, impeccably dressed woman who knows the full extent of Samantha's OCD. She manages Samantha's medication and provides a private environment for her to discuss her intrusive thoughts. She consistently encourages her patient to distance herself from toxic friendships and cultivate genuine connections.

Alexis is the beautiful, unspoken leader of the Crazy Eights clique. She dictates the group's social calendar, decides who is invited to exclusive events like her spa birthday party, and maintains a strict hierarchy among her friends. She expects total loyalty and transparency from those in her inner circle.

Kaitlyn is a highly vocal and often cruel member of the Crazy Eights. She enforces the group's superficial standards and does not hesitate to mock others, including her own friends. She relies on Alexis's approval to maintain her status and enjoys exerting power over weaker peers.

Olivia is a core member of the Crazy Eights who has known Alexis since preschool. She comfortably occupies the upper tier of the group's hierarchy and rarely challenges the toxic dynamics at play.

Hailey is the least valued member of the Crazy Eights. She frequently endures exclusion from group events and mockery from Kaitlyn, struggling to maintain her precarious position within the popular crowd.

Sydney is a heavyset, confident member of the secret poetry club. She introduces a sense of levity to the group's meetings and helps guide new members through the club's traditions.

Emily is a member of Poet's Corner dealing with severe family trauma. She uses the poetry club as an outlet for her grief regarding her mother's terminal illness.

Cameron is a member of Poet's Corner who uses the stage to process his parents' divorce. He channels his anger and heartbreak directly into his poetry.

Abigail is a member of Poet's Corner who writes about the contrast between her internal insecurities and her outward persona, finding her true voice only when on stage.

Jessica is a bold performer in Poet's Corner who incorporates physical beats and group participation into her poetry readings.

Chelsea is a member of Poet's Corner who uses the space to process her romantic breakups, performing her work with sincerity.

Samantha's mother is highly trained in recognizing and de-escalating her daughter's OCD-induced anxiety attacks. She works diligently behind the scenes to keep sharp objects hidden and provide a supportive home environment.

Devon is a varsity athlete and AJ's ex-girlfriend who recently moved to Boston. She serves as the primary target for one of Samantha's obsessive research spirals.

Kyle is AJ's popular freshman brother. He plays soccer and represents the conventional high school success that AJ claims to feel a complex about.

Brandon is a junior swim coach at the summer pool sessions. He inadvertently becomes the subject of Samantha's vivid daydreams before pulling her focus back to college scholarships.