The allegory follows Miss Church-Member after she meets the persuasive Mr. World and accepts a journey along the Broad Highway, where they encounter personified institutions and schemes—optical colleges, pawn shops, theatres, schools, rival churches, auctions, hospitals, and secret services—that exemplify modern temptations and compromises. Episodes expose deceptive interpretations, moral decline, and the consequences of worldly conformity, contrasting these with the King’s Highway of steadfast faith. The narrative maps a spiritual descent through remorse and the Valley of the Shadow of Death, presenting a moral warning about the costs of compromise and the need for faithful perseverance toward salvation.