Set in 1960s Essex, the musical follows Caroline, a young woman whose days at the local greengrocers contrast sharply with the energy of her nights spent walking the pier with her best friend and sharing records with her boyfriend Robbie. When Robbie unexpectedly lands a role with Radio Caroline, the pirate radio station broadcasting from a ship off the coast, the couple are pulled into a moment of cultural upheaval that begins to alter their futures. As the music revolution gains momentum, Caroline finds herself at the center of a movement that challenges her expectations and expands her world.