"Unbeknownst to her many fans, Quin Archer, the revenge-loving queen of the reality-TV show "Payback," was once an angry teen named Heidi--and her true story may be known only to Agnes, who was her art teacher at a private New England girls' school in the 1970s. Then a young woman herself, Agnes saw a spark of originality in the brooding Heidi. But when she suggests Heidi visit the Museum of Modern Art in New York, the girl returns with a disastrous...