Sara is alone when Robert enters, declaring her to be faithless because she has married Nottingham while he was in Ireland. She defends herself saying that it was the Queen's idea and that she was forced to do her bidding. At the same time, seeing the ring on Robert's finger, she assumes it to be a love token from the Queen, and tells him that they must never see each other again, giving him the blue shawl as a love token. In a final duet ("Dacchè tornasti, ahi misera") each declares love for the other and they accept that they must say goodbye. Robert makes plans to escape.