But perhaps the show stealer of the evening was soprano Katherine Polit who sang the role of Aennchen, Agathe’s sprightly and unperturbable cousin. In an opera that occasionally gets carried away with religious overtones, the role of Aennchen provides light, slightly comic relief and needs a voice to match. That voice belonged to Ms. Polit, who seems to have had a great deal of fun portraying her character, giving the audience and the cast a lift whenever it was needed.