The future of Marguerite, a brilliant student in Mathematics at the prestigious Ecole Normale Supérieure, seems all planned out. The only woman from her year, Marguerite is finishing a thesis she has to present to an audience of researchers. On the big day, a mistake shakes all her certainties and all her foundations collapse.
Behind the magnificent Taj Mahal lies a cluster of dingy homes where Chanda (35), a domestic help, lives with her 14-year-old daughter Appu. Chanda aspires and dreams that her daughter will study and embrace a better fate. When Appu tells her she wants to quit school and become a maid like her, Chanda takes a strong decision: she will herself go back to school, and even join the class of her daughter.
An injury ended Zhang Zhiqiangs dream of becoming a professional basketball player, so he became a physical education teacher. To impress the new young math teacher, he volunteers to teach the problem class of the school in math.