Review of Messiah

I really did like this series Messiah, the drama the cast just fantastic. The ploy the suspense everything. in comparison of other dramas per example of American drama big difference. British drama is great so real so close to people humane and the music used in this series is wonderful. I would like to know the title of the opera played in the episode 3 or two, I do not remember. I think it was the episode where the daughter avenge her father who was wrongly accused. She starts killing the dearest person to the people she saw them responsible of her father situation. Can any one tell me the name of the opera or the aria . I really did like it and I cannot remember the title of that beautiful aria, I will be waiting to see if any one can help me here.