Fall, 1970. At the start of eighth grade, Peter Selgin fell in love with the young teacher who'd arrived from Oxford in Frye boots, with long hair, and a passion for his students that was intense and unorthodox. The son of an emotionally remote inventor, Peter was also a twin with a burning need to feel unique. The teacher supplied that need. They spent hours in the teacher's cottage, discussing books, playing chess, drinking tea, and wrestling. They...