"Invisible String" is a romantic song about Swift and Alwyn being tied together even before they met. When he first arrives in LA, he hears "Bad Blood" on the radio and goes to her favourite restaurant for dinner. When they go on holiday in England's Lake District, a "bold" waitress says she looks like "an American singer." In the end, Swift brings Alwyn to the park in Nashville where she used to imagine she'd meet someone and fall in love.