A young Boston janitor, Will, works at the prestigious Massachusetts Institute of Technology (MIT). Despite his humble job, he's a mathematical genius with a troubled past and runs into legal trouble. His intellectual prowess is discovered when he solves a complex math problem left by a professor for his graduate students. This professor, recognizing Will’s potential, bails him out of jail on the condition that he studies mathematics under his guidance and sees a therapist to address his emotional issues.

Will is initially hostile and dismissive towards therapy but eventually forms a bond with Sean, a therapist with his own personal struggles. Through their sessions, Will begins to confront his past traumas and realizes the value of his relationships, including his best friend who wants more for his life. As he navigates personal growth, Will grapples with his future potential and the expectations placed upon him, which leads to pivotal decisions about his life and relationships.