Happiness is a warm gun.And it's aimed at the Fab Four.Fifteen year-old Marnie Culpeper really needs someone. After her mom walks out on her ex-Marine dad, she clings to the only thing that gives her peace: her fanatical love for the four mop tops from Liverpool. She could listen to the Beatles eight days a week. So, when Marnie learns the Beatles are coming to her hometown of Memphis, Tennessee in the summer of 1966, she's in heaven. But then John...