2005
http://www.bookcrossing.com/feedservice/books/8460990 Amelia and her friends have lived in a strict English boarding school as long as any of them can remember. There are only five students, and none of them know their real names, or even how old they are. The teenagers are precocious and rebellious, and they all seem to have extraordinary abilities.
This book was quite scattered and had an unnecessarily huge cast of mysterious characters who may or may not be the kids' enemies, and it ends in a cliff hanger. You will have to wait until the next book to find out what happens. But I just don't care.