Louisa Clark, a quirky and cheerful young woman, lives in a small English town and works various odd jobs to help support her family. After losing her waitressing job, she takes a position as a caregiver to Will Traynor, a wealthy young banker who was left paralyzed from an accident two years earlier. Initially, they struggle to connect due to Will's bitterness and frustration with his situation. As time passes, Louisa's sunny disposition and colorful personality begin to penetrate Will's gruff exterior. She introduces him to activities that bring some joy back into his life, slowly building a closer relationship between them.

Louisa discovers that her role as a caregiver is more emotionally complex than she anticipated, requiring her to confront her own values and beliefs. The bond they form challenges her to re-evaluate her future and ambitions. Their evolving friendship impacts both of their lives deeply, forcing difficult decisions and significant personal growth. The experiences and choices made lead Louisa on an unexpected path of self-discovery and transformation.