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An Invisible Sign is an upcoming drama film, directed by Marilyn Agrelo, starring Jessica Alba, JK Simmons, Chris Messina, Sophie Nyweide and Bailee Madison. Filming began in New York. An Invisible Sign is based on the book by Aimee Bender. It is set for release on May 6, 2011. PLOT : Mona Gray is a 20-year-old loner who, as a child, turned to math for salvation after her father became ill. As an adult, Mona now teaches the subject and must help her students through their own crises.