Jay Wheeler, the "black sheep" of his wealthy family, is tasked with picking up his estranged brother Michael from a mental institution in order to attend their sister's wedding. While at the institution, Jay meets Daisy Kensington, a young patient who has been raised in isolation her entire life and is being released into society for the first time. Jay impulsively decides to take Daisy as his date to the wedding, despite reservations from his family.
As they spend more time together, Jay and Daisy begin to develop a connection. Daisy's simple and unfiltered views on life intrigue and challenge Jay, who is struggling with his own identity and purpose. Meanwhile, Daisy's gradual integration into society leads to a series of comedic and heartwarming moments, as she experiences everything from buying shoes to going to a club for the first time.
As the wedding approaches, tensions arise within the family, with Jay's father and Michael both disapproving of his relationship with Daisy. However, Daisy's pure and genuine nature wins over everyone she meets, including Michael, who forms a bond with her over their shared experiences of isolation.
In the end, Jay and Daisy's unlikely romance proves to be a catalyst for healing and reconciliation within the family, as they confront their own issues and learn to accept each other for who they are.