An aging rock star receives a life-changing letter and decides to find out what his life could have been like. Still riding high on the hits from his heyday, singer Danny Collins (Al Pacino) seems to have it allโmoney, fame, a new fiancรฉe and arenas packed with adoring fans. But years of hard living, failed relationships and performing the same songs night after night have begun to take their toll on the once wild rocker. So when his longtime manager (Christopher Plummer) presents him with a never-delivered letter written to him 40 years earlier by John Lennon, Danny decides to belatedly heed his idolโs advice and follow his heart. He cancels a sold-out tour and checks into a small-town New Jersey hotel to try to rediscover his love of music and the family he abandoned on his way to stardom.