The beautiful girl Mona Gray ( Jessica Marie Alba ) has been fascinated by numbers since she was a child, and has admired her father ( John Shea ), an outstanding mathematician, since childhood. In her eyes, her father's world is full of wonderful numbers, like some kind of invisible symbols, revealing the way to the other side of the mysterious world for her.
Since Mona was sensible, she has been running races with her father every day, until one day, her father lost his former style due to a strange illness, and the door to Mona's spiritual world gradually closed, and her love for numbers became the connection between her and the world. the only bridge. At the age of 20, under the arrangement of her mother, Mona became both excited and scared to become a third-grade math teacher. While teaching, she meets the lonely little girl Lisa ( Sophie Nyweide ) and the eccentric nature teacher Ben Smith ( Chris Messina ), and Mona's life changes.
