- Dora arrives at the party. Guido sees her and realizes she's the poor woman marrying Rodolfo.
- Guido runs into Dr. Lessing checking out of the hotel. The two say goodbye, complementing each other on their wit and culture. Dr. Lessing gives Guido a riddle as a parting gift: "If you say my name, I'm not there anymore. Who am I?"
- Guido solves it soon after Dr. Lessing leaves: "Silence."