Princess of the Night and Prince of the Day
Finding that book on the street the other day was almost equal to finding a treasure, really.
She has learned the invisibility spell from this grimoire, but only barely, after two years of practice. Whether this speed is slow, she does not know; she has met no one who can turn invisible—even if they were, they wouldn’t have told her about that, anyway. To admit honestly, she was proud of herself when she finally achieved it.