 Nell is a girl who s been brought up in an isolated world. The only person she knew was her mother and twin sister. They lived together in a cottage in the forest. Nobody has ever met Nell. After her mother s death, she s discovered by the local doctor Jerome. He s fascinated by her, since she speaks an mangled language, developed by her sister and herself growing up; "twin speak" if you will. But Paula, a psychology student, wants her observed in a laboratory. The judge decides they get three months to observe her in the forest, after which he ll decide about Nells future.