Fantastic Four star Jessica Alba headlines director Marilyn Agrelo's feature-film adaptation of author Aimee Bender's popular novel of the same name. The story centers on Mona Gray, a young girl who turned to mathematics as a means of dealing with a devastating family illness. Years later, Mona teaches the subject, and does her best to help her students contend with their own personal crises. An Invisible Sign of My Own was adapted for the screen by Wedding Planner scribes Michael Ellis and Pamela Falk. ~ Jason Buchanan, All Movie Guide