Adele tells Imogene that Gualtiero wishes to see her before he leaves. She is reluctant, but she recognises that she must do it. As she is about to leave, Ernesto arrives and accuses Imogene of being unfaithful to him: (Ernesto, aria: "Arresta / Ognor mi fuggi" / "Stay! You continually avoid me! Now the time has come for me to have you at my side"; then duet.) She defends herself by saying that her continuing love for Gualtiero is based solely on her remembrance of their past encounters. Ernesto is inclined to take her word for it, but, when a message is delivered in which he is told that Gualtiero is being sheltered in his own castle, he is consumed by rage, demands to know where his enemy is, and then storms out. Imogene follows.