
Count on the unexpected.
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.
Status
Release Date
October 6, 2010
Runtime
1h 36m
Revenue
$51,138
Rating
(116 votes)
Genres
Production Companies
Overview
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.
An Invisible Sign | trailer US (2011)

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