Moroli (S01E08)

Though Robert has no desire to confront the creature preying on affluent young men, the clues he uncovers prove too intriguing to ignore. His investigation brings him face-to-face with a stunning vampire who reveals herself as his sister, Olalla. She also shares the startling news that Dance is still alive and being restored by eel-like beings. Distrustful of her intentions, Robert devises a challenge: if she can transform into a Jekyll, he will accept her claims as truth.