Luisa declares her love for Wurm and states that she has tricked Rodolfo. Initially resisting (Tu puniscimi, O Signore / "Punish me, o Lord"), she gives way and writes the letter at the same time being warned that she must keep up the pretense of voluntarily writing the letter and being in love with Wurm. Cursing him (A brani, a brani, o perfido / "O perfidious wretch"), Luisa wants only to die. Scene:2: A room in Count Walter's castle At the castle Walter and Wurm recall how the Count rose to power by killing his own cousin and Wurm reminds the Count how Rodolfo also knows of this. The two men realize that, unless they act together, they may be doomed (Duet: L'alto retaggio non ho bramato / "The noble inheritance of my cousin"). Duchess Federica and Luisa enter. The girl confirms the contents of her letter. Scene 3: Rodolfo's rooms Rodolfo reads Luisa's letter and, ordering a servant to summon Wurm, he laments the happy times which he spent with Luisa (Quando le sere al placido / "When at eventide, in the tranquil glimmer of a starry sky"). The young man has challenged Wurm to a duel. To avoid the confrontation the courtier fires his pistol in the air, bringing the Count and his servants running in. Count Walter advises Rodolfo to revenge the offense he has suffered by marrying Duchess Federica. In despair, Rodolfo abandons himself to fate (L'ara o l'avello apprestami / "Prepare the altar or the grave for me"). Act 3 A room in Miller's home In the distance echoes of the celebration of Rodolfo and Federica's wedding can be heard. Old Miller, freed from prison, comes back home. He enters his house and embraces his daughter, then reads the letter she has prepared for Rodolfo. Luisa is determined to take her own life (La tomba è un letto sparso di fiori / "The grave is a bed strewn with flowers"), but Miller manages to persuade her to stay with him. (Duet: La figlia, vedi, pentita / "Your child, see, repentant"). Alone now, Luisa continues praying. Rodolfo slips in and unseen pours poison into the water jug on the table. He then asks Luisa if she really wrote the letter in which she declared her love for Wurm. "Yes," the girl replies. Rodolfo drinks a glass of water and passes a glass to Luisa, inviting her