America Ferrera has signed on to star in An Invisible Sign of My Own, a coming-of-age drama that will also mark Marilyn Agrelo's first directorial effort.

The movie, expected to begin shooting shortly, is based on Aimee Bender's quirky novel about a 20-year-old loner named Mona Gray (Ferrera) who as a child turned to math for salvation after her father became ill. As an adult, Gray now teaches the subject and must help her students through their own crises. "Wedding Planner" scribes Michael Ellis and Pamela Falk penned the screenplay, according to The Hollywood Reporter.