Sarissa

Sarissa was a changeling, later the Summer Lady. She first appears in Cold Days.

Cold Days
In Cold Days, Sarissa is introduced first as Harry Dresden's caretaker and then his date to his birthday celebration. She informs him of the rules of the Winter Court, and backs him up during the fight with the Redcap.

She is Maeve's twin sister and Mab's daughter, trained to replace Maeve because of her illness. Maeve's killing of Lily, however, made her the new Summer Lady.