Veronika. Caroline. Isobel. Eleanor. One blond, one brunette, one redhead, one with hair black as tar. Four otherwise identical girls who spend their days in sync, tasked to learn. But when May, a very different kind of girl --the lone survivor of a recent shipwreck -- suddenly and mysteriously arrives on the island, an unsettling mirror is about to be held up to the life the girls have never before questioned.