W.I.T.C.H, part 2, Nerissa's Revenge, volume 1

A guardian scorned. In the aftermath of their first adventure, Will, Irma, Taranee, Cornelia and Hay Lin have unleashed a dormant evil... Corrupted by a power greater than herself, the ex-Guardian Nerissa reemerges to threaten Kandrakar, and only the girls of W.I.T.C.H. can stand in her way!

I know who you are -- End of a dream -- The courage to choose -- The mark of Nerissa.