The Silent Twins: A true story of love and hate, dreams and desolation, genius and destruction Hardcover – October 15, 1986 by Marjorie Wallace
 
This is the astonishing tale of June and Jennifer Gibbons, identical twins whose silent, antisocial exterior hid a rich, vast, creative life. From their early childhood through their twenties, they spoke only to each other in a secret language, building an elaborated fantasy life. From their self-imposed isolation, they were catapulted into the hormonal havoc of adolescence - plunging into a wild spree that ultimately led to their incarceration in a hospital for the criminally insane.
 
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