Watch If I Stay movie online on 123movies, Based on Gayle Forman's novel of the same name. "If I Stay" is the story of the gifted classical musician Mia and her boyfriend, Adam, an up and coming indie-rock star. Torn between two paths in life, her art or her relationship, Mia is forced to make an even starker choice between life and death when she is caught in a fatal car accident with her family one snowy morning in Oregon.