Teen Titans plus one more (Nightingale is found)

The Teen Titans( not ttg but the original) find a girl being chased by thugs ordered by Kitten. Robin is determined to find more about this girl and the girl he read in a book whose powers match the chased girl. She may or not become Robin's adopted sister.

P.s. I don't own any of these characters only Nightingale. And I am again writing this story with my brother so comment and vote.