After experiencing the disintegration of their parents' marriage, Claudine and Janine Beaulieu's lives are further complicated when their mother Odette remarries an Anglophone and they are forced to "turn English."

Now, years later, Claudine has made a career out of documentary filmmaking, focusing on the painful lives of other women; Janine, a wife and mother, questions her feelings for her sister's boyfriend; and Odette succumbs to her Valium and rum addiction in a luxury retirement villa in Jamaica. Shifting from Duplessis's Montreal of the fifties to Toronto in the eighties, Voice-Over chronicles the lives of a mother and daughters struggling to find their voice in a bilingual country.