After contemplating a drastic step from the Brooklyn Bridge, 16-year-old Craig Gilner (Keir Gilchrist) makes the pivotal decision to seek help at a hospital. He urgently expresses his need for assistance to Dr. Mahmoud (Aasif Mandvi), leading to Craig's admission to the psychiatric ward for a week. Initially, uncertainty clouds Craig’s mind as he worries about missing school and what his friends, especially his crush Nia (Zoë Kravitz) and her boyfriend Aaron (Thomas Mann), might think. Complicating matters, he finds himself in the adult ward due to a lack of teenage patients, leaving him feeling out of place and apprehensive amidst the older individuals dealing with their own struggles.
In this unfamiliar environment, Craig meets Bobby (Zach Galifianakis), an adult patient who lightheartedly claims he’s merely on vacation. Bobby mentors Craig through shared experiences within a group discussion, where he expresses nerves about an impending interview meant to facilitate his transition to a halfway house. Recognizing Bobby's stress, Craig offers one of his father’s dress shirts for the interview, an act of kindness that doesn't go unnoticed by Noelle (Emma Roberts), a fellow teen patient facing her own challenges. Noelle, inspired by Craig’s gesture, invites him to meet that evening.
Together, Craig and Noelle participate in a creative painting session where Craig imagines and illustrates a city map that symbolizes his mind. As he acclimates to hospital life, Craig develops deep connections with Bobby and Noelle, including discovering Bobby’s heartbreaking truth: he is a father and has faced several suicide attempts. In this supportive exchange, Craig gathers the courage to ask Noelle out, embodying the mutual empowerment fostered in the ward.
A pivotal moment unfolds when Nia visits Craig and reveals her recent breakup with Aaron. During a private moment, she attempts to seduce him, but their interaction is interrupted by Muqtada (Bernard White), Craig’s elderly roommate. As Nia hurriedly exits, Craig, caught in the moment, professes his love for her, not realizing Noelle stands right behind him, leading to her dismay and departure with a self-portrait she had planned to give him.
As Craig navigates his journey, he eventually reconciles with Noelle, and together they steal a moment outside the constraints of the ward, running through the hospital in scrubs and ultimately sharing a kiss on the roof. On his final night, Craig brings joy to his fellow patients by orchestrating a pizza party and encourages Muqtada to step beyond the confines of his room with the power of music. Craig’s farewell to Bobby, who has been accepted into the halfway house, is marked by a touching exchange of imagined brain maps.
When Craig leaves the hospital the next day, he carries with him not a complete cure but a renewed resolve to embrace life. He musters the courage to confront his father about his own aspirations, which contrast with his father's ambitions for him to be a corporate success. Craig starts to realize where his true passions lie—in the realms of creativity through painting and singing.
