In Plain Sight, Season 4

Mary:
[voicover] There comes a time when every kid peeks behind a curtain and sees she's not the only one putting on a show. Fathers, mothers, cops and robbers, every member of the PTA: all playing dress up, all wearing their masks; a constant Halloween. That first peek behind the curtain, the lifting of the mask, it's a disorienting moment. The solid ground beneath you slips away to quicksand, along with all you thought you knew. But you realize, as days and nights go by, that there's a kind of truth in the lie. That the mask is often more revealing than the face that lies beneath, because the person you pretended to be, the mother, the father, the sister, the cop, became, somehow, the person that you are.