Synopsis for
An Invisible Sign (2010) More at IMDbPro »

Based on the book by Aimee Bender. Math whiz Mona Gray has elected to systematically withdraw from life after a mysterious illness leaves her DAD all but a shell of his former self. When she gets a job as the math teacher at an elementary school, she discovers she has an unorthodox talent for teaching and finds herself thrust back into life again, with children to care for, a man to love, and a reason to live...

The story centers on Mona Gray, who as a young girl gives up everything important to her in life, except mathematics, as part of a "deal with the universe" to help restore her father (a mathematician) to health. Years later, Mona teaches the subject, and does her best to help her students contend with their own personal crises.