chunk: Nugent is secretly infatuated with Lucilla and now manipulates her into believing that he is Oscar. As Lucilla gradually regains her sight, Herr Grosse forbids family and friends from undeceiving her, since the shock might imperil her recovery. Oscar goes abroad, resigning his fiancee to his brother in despair. Madame Pratolungo intervenes decisively with Nugent, appealing to his conscience and threatening him with exposure if he continues with his plan to marry Lucilla under Oscar's name. He promises to go abroad to find his brother and return him home.