While vacationing in Italy, a married American woman, Mary Forbes (Jennifer Jones), becomes entangled in an affair with Italian academic Giovanni Doria (Montgomery Clift). She decides to break off the affair and goes to Rome’s Stazione Termini to leave by train for Paris. As she says goodbye, he tries to make her stay and confesses his love for her. Together they wander the Termini station but ultimately she leaves him behind to go back to her husband.