If "Mastermind" is about Alwyn, as it seems to be, it provides some new insight about the start of their relationship. In the song, she confesses that she orchestrated the beginning of her relationship. "So I told you none of it was accidental and the first night that you saw me nothing was gonna stop me," she sings. But she reveals that the subject of the song always knew their meeting wasn't by chance. "I laid the groundwork and then saw a wide smirk on your face / You knew the entire time," she continues. "Mastermind" feels like a response on "Invisible String," an admission that it wasn't the full truth.