What does Frank tell those he finds awake when he arrives home after the break-in?

When he arrives home, Frank finds Dolly and Ben are studying, and that Lisa is sewing. Frank tells them about his encounter with the student at Reid Press that evening after hours. Lisa inquires as to his name, and where he has gone. When Frank responds that he thinks he went back home, Lisa asks if he will return. Frank says he thinks it is unlikely.