Five sisters alone in a Transylvania castle during a long, dark winter; five sisters with a secret portal in their shared bedroom, leading them to a fairy court; five sisters whose lives begin to fall apart as their childhood dreams begin to clash with the outside world. Can a book really get much more lolita-esque than that?
In summary: Jena and her four sisters have been sneaking off every full moon for years, through the magic gateway in their room and into the court of the fairy queen, where they dance the night away. When their merchant father falls ill and must spend the harsh winter recovering in a warmer climate, they are left alone to handle the castle - and the predatory encroachment of their cousin, who does not believe women can handle business, or even managing their own house, without the protection of a man. At the same time, the mysterious arrival of the Night People to the fairy court throws the supernatural balance out of whack, leading to a confrontation between the fairy court and the human realm.
The only caveat I had about this book: the writing is lush and dense, much more so than most contemporary young adult novels. That makes it a slow read, great for those who enjoy spending loads of time exploring a novel, and possibly frustrating to those who (like me) are anxious to find out what happens in the end! And for those who do want more, there's apparently a semi-sequel available, called Cybele's Secret.