Orphans of Chaos — John C. Wright

WHAT IF YOUR TEACHERS TOLD YOU EVERYTHING -- EXCEPT WHO YOU REALLY ARE?

For Amelia and her friends, the strict English boarding school she lives in is all she has ever known. The sprawling estate, bordered by unknown territory on all four sides, is an orphanage and an academy, but it's also a prison. The school has a large staff, but only five students, none of whom know what their real names are, or even how old they are.

Precocious and rebellious, all five teenagers are more than just prodigies. Amelia can see in four dimensions. Victor can control the molecular arrangement of matter. Vanity can find secret passageways where none existed before. Colin is a psychic. Quentin is a warlock.

And, as time goes by, they're starting to suspect that none of them are entirely human. . . .