California; Sandra Tannen is now a professor of linguistics at UCLA and has two teenage daughters, however, she is still not allowed to have any contact with Katie, who lives in a foster home nearby. The last message before the screen turns black and the credits appear, reads: "Katie's inability to learn a language proved the legitimacy of the Critical Period Hypothesis". Katie is a girl who was locked in a closet form ages 1-13 Cast References External links Mockingbirds Don't Sing at Variety 2001 biographical drama films American biographical drama films American independent films American Sign Language films Drama films based on actual events Films set in Los Angeles Films set in 1970 Films with screenplays by Daryl Haney 2001 drama films 2001 independent films 2001 films 2000s English-language films Films directed by Harry Bromley Davenport 2000s American films