Princes — Sonya Hartnett

In a dilapidated mansion overrun by rats, Indigo and Ravel Kesby have gone to war. Identical twins, their two selves have gradually entwined until they have become all but interchangeable: no one can tell them apart. But when one twin attempts to sever the ties to his brother, their insular world quickly disintegrates into madness, treachery, and violence. As the story sweeps toward a shocking and inexorable conclusion, identity becomes a malleable weapon that will ultimately differentiate brother from brother--and victor from victim. Sonya Hartnett infuses gothic horror with menace in this mesmerizing story of twins-turned-enemies. About her last novel, Robert Cormier said [She] has truly pushed the boundaries of YA literature to their outer edges and perhaps beyond.