We don't have secrets, Sheba and I From the first day that the beguiling Sheba Hart joins the staff of St George's, history teacher Barbara Covett is convinced that she has found a kindred spirit. Barbara's loyalty to her new friend is passionate and unstinting and when Sheba is discovered having an illicit affair with one of her young pupils, Barbara quickly elects herself as Sheba's chief defender. But all is not as at first it seems in this dark story and, as Sheba will soon discover, a friend can be just as treacherous as any lover.