The astonishing tale of June and Jennifer Gibbons, identical twins whose silent, antisocial exterior hid a rich, creative life. From early childhood through their twenties, they spoke only to each other in a secret language, building an elaborate fantasy life. Then from their self-imposed isolation, they were catapulted into the hormonal havoc of adolescence, plunging into a wild spree that led to their incarceration in a hospital for the criminally insane. Investigative journalist Wallace reveals their genius, alienation and the mystic bond by which the extremes of good and evil ended in possession and death.