The headmaster's wife - Thomas Christopher Greene

Arthur Winthrop is a middle-aged headmaster at an elite prep school in Vermont. When he is arrested for an act that is incredibly out of character, the strait-laced, married headmaster confesses to a much more serious crime.
Arthur reveals that he has had a passionate affair with a scholarship student called Betsy Pappas. But Betsy is a fickle and precocious teenager. When she switches her attentions to a classmate, Arthur's passion for Betsy turns, by degrees, into something far darker. Now Arthur must tell the truth about what happened to Betsy. But can Arthur's version of events be trusted - or is the reality much more complex and unnerving?
The Headmaster's Wife is a dark, sinuous and compelling novel about marriage and obsessive love.