An Invisible Sign (2010)

5.4

Netflix rating: 5.4
Metacritics rating: 23.0

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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. When a puzzling disease devastates her beloved father, mathematics prodigy Mona Gray isolates herself and turns to the world of numbers for comfort.